腾讯安全科恩实验室（以下简称“腾讯科恩”）持续基于多源数据的威胁情报分析，以及系统自动化方式，追踪捕获基于钓鱼样本的攻击事件。近日，腾讯科恩发现“银狐团伙”正通过随机化特征的方式对抗安全软件的检测，具体行为包括样本文件hash随机化和C2地址批量生产。在情报自动化分析系统中，我们在同一天会捕获到大量的相似样本，样本之间仅存在少量字节不同，疑似通过自动化工具批量生成。同时C2 IP地址也存在A段、B段相同的情况，疑似从网络服务商批量购买了IP地址用作远控木马的C2服务器。
同时间段出现的高度相似钓鱼样本列表：
md5 | 文件大小 | 发现时间 |
5c08352f8dcf3b2a41122f249d03b942 | 25297456 | 2024-06-20 09:42:28 |
30c9bffeef7c5598279030e7e5675547 | 25297456 | 2024-06-20 10:51:04 |
93a50397e4d616811e8f4e75d60446e0 | 25272320 | 2024-06-20 10:58:10 |
5578bca9c64b768a9ed0202546dbf139 | 25297456 | 2024-06-20 12:07:22 |
e1a6bad0a3a2e1040d730a2d6694fc1c | 25284840 | 2024-06-20 14:14:25 |
152dba380ec0e9874d03c6c904c5b719 | 25284840 | 2024-06-20 15:18:35 |
e59b389e739af82429ff19e707b6eb61 | 25297456 | 2024-06-20 16:19:37 |
c42965e57680bb86a1ec73706df4f5cb | 25284840 | 2024-06-20 16:47:14 |
4cdc98b6d6922ed9a53b69f0fab3ede6 | 25284840 | 2024-06-20 17:05:28 |
9f9c2e9c586f2b6d9c8d4e738863e1a9 | 25284840 | 2024-06-20 17:37:50 |
3bfb555bfdc4c460fa55389b086496d5 | 25284840 | 2024-06-20 17:45:09 |
29ca6a80ce27d671392f87ad1c91fbc5 | 21843968 | 2024-06-21 09:30:47 |
b5f583f9ad55b3b1df72b19778c133ce | 25297456 | 2024-06-21 10:21:48 |
33642d364eb40bbcaa2a8db424fd7947 | 21843968 | 2024-06-21 10:30:49 |
679b102b2f7e22201467fa1679538b33 | 21869120 | 2024-06-21 11:27:19 |
a3e2e7ca1c713b9b456e8bf911e8b61b | 21869120 | 2024-06-21 12:46:37 |
be600a6b5fea37ad1e63270d5e1f32d4 | 21843968 | 2024-06-21 12:48:26 |
46b0a09df4050f163695eeb1a3e19b2b | 22319680 | 2024-06-21 14:03:10 |
4f6090a4699ddb1a7a1db48b3516c970 | 21869120 | 2024-06-21 14:24:57 |
48981e3503ded6fdc025322f0a78d585 | 22319680 | 2024-06-21 14:35:29 |
37a0f97f8d0a115ac4da4fc755a5baa8 | 21869120 | 2024-06-21 14:47:56 |
cc988bd086032e009fee7cdd58dfd442 | 21869120 | 2024-06-21 16:13:38 |
钓鱼攻击使用的同网段C&C：
154.39.249.194[:]3760 |
154.82.92.17[:]3760 |
154.91.64.155[:]3760 |
156.225.58.58[:]3760 |
156.234.0.20[:]3760 |
156.234.0.32[:]3760 |
206.233.128.109[:]3760 |
206.238.115.146[:]3760 |
206.238.115.184[:]3760 |
206.238.197.185[:]3760 |
206.238.198.20[:]3760 |
206.238.198.233[:]3760 |
206.238.199.40[:]3760 |
206.238.221.220[:]3760 |
在钓鱼样本文件的命名特点上，以"合同"、"查询"、"表格"为关键词进行命名的有所增多，此外还出现了使用"ziliao"、"mingdan"、"cailiao"等拼音来代替原有的"资料"、"名单"、"材料"等关键词，企图以此来对抗情报自动化分析系统的感知策略。
钓鱼样本文件样例如下：
md5 | 文件名 |
6b76457c570f41f07d88c06dde996b05 | ziliao-pdf-moban6.03.exe |
33fc4d1e0ff95975dc801c593474dfa4 | ming-dan.exe |
30d3e1468412556b54b959dd9d2c65cf | mingdan.exe |
4ddeecd15da7bf9da28de2b899010316 | cailiaoPDF-mobanDOC.exe |
93a50397e4d616811e8f4e75d60446e0 | ziliao-PDF.exe |
5d983954e643aa72412f8df0db713975 | cailiao-mdPDF.exe |
a38651421c3f327601e6d6c28e361a7b | mingdan-PDF.exe |
d50b5470a52512ed405dc9d78dad9e98 | ziliao-PDF.exe |
ef1a6069c5d334a7dcb68b1ac392eb6a | mingdan.exe |
9166ca99fd8d85eca258a3d671a36c87 | mingdan.exe |
根据腾讯科恩威胁情报中心统计数据显示，6月初至7月银狐钓鱼攻击呈现增长趋势，通过威胁情报云查拦截的攻击平均每天超过11万次，高峰时期一天超过27万次。并且攻击样本呈现出批量化、自动化生产的特点，部分具有明显共同家族特征的的样本，近一个月内检测出300多个变种。
在当前重保以及银狐黑产团伙活跃的背景下，腾讯科恩提醒广大用户在打开任何从外部获取的文件之前，务必验证其来源的可靠性，不要随意打开来自未知或不可信来源的文件，特别是后缀名为".exe"、".msi"的文件。在电子邮件或即时通讯消息中，不要随意点击链接，尤其是指向不明网站或要求立即下载文件的链接。
2.技术分析
同源样本之间在二进制数据层面仅存在微小差异：
部分样本通过将PE文件入口修改到非text段来逃避检测：
母体样本运行后会通过弹窗提示迷惑用户：
然后在用户文档目录下释放木马文件Tomcat.exe并启动，然后删除母体文件：
将木马exe创建快捷方式wps.lnk，并写入开机启动项：
Tomcat.exe在内存加载并执行shellcode：
连接C2地址156.225.58[.]58[:]3760：
木马上线后搜集用户名、系统版本、CPU等信息发送至远端：
发送命令获取当前系统安装软件列表，并持续通过其他指令对机器进行远程控制，部分指令为明文字符串，例如"GetSoft"为获取当前系统安装软件列表：
相关IOC
| 118.107.42.171[:]3706 |
| 143.92.48.166[:]3706 |
| 154.39.249.194[:]3706 |
| 154.82.92.17[:]3706 |
| 154.91.64.155[:]3706 |
| 156.225.58.58[:]3706 |
| 156.234.0.20[:]3706 |
| 156.234.0.32[:]3706 |
| 156.240.242.2[:]3706 |
| 156.251.17.69[:]3706 |
| 206.233.128.109[:]3706 |
| 206.238.115.146[:]3706 |
| 206.238.115.184[:]3706 |
| 206.238.115.233[:]3706 |
| 206.238.196.149[:]3706 |
| 206.238.196.17[:]3706 |
| 206.238.197.185[:]3706 |
| 206.238.197.223[:]3706 |
| 206.238.198.20[:]3706 |
| 206.238.198.23[:]3706 |
| 206.238.198.233[:]3706 |
| 206.238.199.40[:]3706 |
| 206.238.221.220[:]3706 |
MD5:
| 93a50397e4d616811e8f4e75d60446e0 |
| 33642d364eb40bbcaa2a8db424fd7947 |
| 9f9c2e9c586f2b6d9c8d4e738863e1a9 |
| 4f6090a4699ddb1a7a1db48b3516c970 |
| 48981e3503ded6fdc025322f0a78d585 |
| 37a0f97f8d0a115ac4da4fc755a5baa8 |
| b5f583f9ad55b3b1df72b19778c133ce |
| 29ca6a80ce27d671392f87ad1c91fbc5 |
| 46b0a09df4050f163695eeb1a3e19b2b |
| 5578bca9c64b768a9ed0202546dbf139 |
| cc988bd086032e009fee7cdd58dfd442 |
| d25e9126e74f1093f35f0dd25064ce46 |
| 4cdc98b6d6922ed9a53b69f0fab3ede6 |
| 30c9bffeef7c5598279030e7e5675547 |
| 3bfb555bfdc4c460fa55389b086496d5 |
| 81ff760fa2fd00a428fb6267b4fa397d |
| 5c08352f8dcf3b2a41122f249d03b942 |
| 152dba380ec0e9874d03c6c904c5b719 |
| 465fbf7671d5a465cbd2f5beeecdbb86 |
| a3e2e7ca1c713b9b456e8bf911e8b61b |
| e1a6bad0a3a2e1040d730a2d6694fc1c |
| 1e8a2685e7a5f270ae24c1085a7cf5e3 |
| 6c96511bba4923cf2bfce64aa6892151 |
| ba3cc50a8b7e6ffc7dfc29622e5cf5dc |
| 679b102b2f7e22201467fa1679538b33 |
| c42965e57680bb86a1ec73706df4f5cb |
| e59b389e739af82429ff19e707b6eb61 |
| be600a6b5fea37ad1e63270d5e1f32d4 |
| 4ea960dd8a5f718f9b2b24b79b4892df |
| e639842e49a5f0ae3578e412f80ea46a |
| 915475082c4ece8f159f3a794fe90bbb |
| 213c108fe48d438061df6e197a03c366 |
| 37ecc6c2799fd75ab3ab21deffc00221 |
| c2ca3b28cbe12eae825c1f0244e19183 |
| 29dd8cd8dbd9adbf22185189b8849595 |
| 24ce1fcccdfafec78996363c2cb039f6 |
| adc365e56603387842aba7f786b03872 |
| a44b6fe4ce2c657ae1f0ab5bffd62b48 |
| 71b28e612164f586d22e4d73b8eab477 |
| 3776f123f9b462909122438b4992fe31 |
| 618e4cbc6dde5c9a2bb60fc515d69c2c |
| 1fdf0817c288c1e18af81f8ca08bf5f2 |
| e6337af355c5daabb068fb740a996eab |
| 3f71703f4d6db77023f777c773d17199 |
| b2ebd322e5d28537dab96ddf4a8923e0 |
| 2b167c677a4b530ea698976ab95738ea |
| 0e83e54d79252cc7e1af2e09cf3bbef1 |
| efc3b07380d322d9713da132001235dd |
| 5cd294b94371d13efabcd5da87debb1e |
| 8d91d692064e16f228a76a9c3b7bba18 |
| 43a44ea09fafa570aead6275cb5a7732 |
| 775e1e9ee1aaaaf336a5aa70e971829a |
| e0056f09d421a4dcfbc069e74c96a89c |
| 495809d6f7bc1080fe8d119d7a0dc72c |
| 23d6b3b2891f74ae1bcac00c572077c9 |
| ae9602f2aef92b96059d170dfbb6c82d |
| c2a6d29f4c94aeeef93161a12ab656c1 |
| 98b2de18f7878ee0db91718bc0777dc2 |
| 8c59ff8b2d4c5d685b82e5a868c25f2e |
| 93b581ed8cef9df055d52650afca8014 |
| daa8f08b53d07b29ae0428f67feb09fb |
| 0bd82b66a22bf6e2ad996f5ddd748ef9 |
| 3becaca2dcdddc45fd722348300e0f1a |
| 83c90e61a05818faa962ea43ca71d490 |
| c239b795d1c76a873406b8cc592f2e0b |
| f41d951ca062b0ed7b280c8162af5e28 |
| 7a82efce200c49f85645b1c2048b495c |
| 4ad09c5d1a431702b37931af6624a2d6 |
| 19936b848f813d4addb7efc3dbe970c6 |
| 71c7bfe08e4f10d1bdcf230837add319 |
| 1cd0d13eec14647afed2c853ebc2efea |
| e6414b1427d54f2d551c99b831244b3e |
| 94fc00f3b2738678eaabf10e1371c968 |
| 8f368b5ba983b61bf6d43a96ec34c492 |
| a5e8f005873aaa08e426e4baf0f9b5b5 |
| aad4360f411a6d350f1b5b3c01526ae3 |
| e711531569d2e446c3501c635b41e89c |
| 52740e63c9a6b6e9aeea0f278de455b3 |
| 5aa7afc7d25ab48dbb218946ad6ee500 |
| 4c1cd201918591cbe98e6db0f21b2488 |
| 05d001649a3c44a1ba5bf974ee43d36f |
| 05667500c91e8d0fcf6458a6b8c68e2c |
| 8e7de5a170ea663b6823f5c67e36a46f |
| aaaac616aaae31df11c06b5f5f3666a1 |
| c30a5e14826f692ccb575002c100f347 |
| b0f837bd1799ccee00f37d2f0a8d210d |
| 4b53eda46731a348cf96a1f9f5e55d79 |
| 1d8800e1624a1cb6d92dee6bf0b853a6 |
| 9b623075e89c0d0bace91c7edac91b4e |
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| 9386d3ff6eb4f00f70b503c5152fd6db |
| f5ea12474b1461fec0a6a88a3831062f |
| 40b01c9a816fdd1bed905be01065f71c |
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| 7aa437395bd17c4118f1ec65be5639cd |
| bf744baa82e827d0cff43df998d5efe3 |
| 3ac79c6e0bf89908d3299c0626ce27a9 |
| f9d772a1dba21d2b96fd42fead7e82d5 |
| 043ce29831861a0ed54e4e83ed463975 |
| bccd141d7b45eeb996a02b1b054ac35f |
| 62c1ce5d8ab09a3cbc5727ee1fbb757b |
| a0326096e584c1194159f024e1fcd775 |
| 9b2dc63c0e916513630fe4660b45cb2d |
| b528d0802179997ffbd993bd93c4628d |
| e2e42d8337b5cd9ba970b5cbb2d94e63 |
| 41899f4832976a54f3763d6789299dca |
| 2111aeb82504e96133f3fbb01645df56 |
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| d41be81c052d01d8c1631f9e9661cf07 |
| 3f1ead10e9fec39370ba0a2c07c34d2a |
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| a1967396e294689ef71433fe1f3b10c6 |
| 878d775f3ed264f8354502e1226fc012 |
| 44cee02b8c97c1f06fbdd9e02b3e865a |
| d39b87d6d056ecedb33f573f8deacded |
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| bf34768f65eac1332faa190d0970cc1d |
| 6dfe366e08951950ad22a0c2fce9d4c3 |
| 1d98e2cfd25a41547a90802556919cc9 |
| 721be4b4e73421dc34ef5d5c19bb211e |
| 49ed775e66e2cd74be732cc95bab5ef0 |
| 9166ca99fd8d85eca258a3d671a36c87 |
| 241013fa7d60361d06e5b741bafea26d |
| 3aae84c3e1eafdad49eb2632c85ba74d |
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| 1b371ddabe058687147de7f3c50fe85e |
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