TA551 (Shathak) pushes IcedID (Bokbot) - SANS Internet Storm Center

TA551 (Shathak) pushes IcedID (Bokbot)
Introduction TA551 (also known as Shathak) represents a threat actor behind malspam that has pushed different families of malware over the past few years. So far this week, TA551 is pushing IcedID (Bokbot). Shown above: Flow chart for this infection. Images from an infection Shown above: Screenshot from a TA551 email with sensitive information removed. Indicators of Compromise (IOCs) The infection process was similar to my previous diary about TA551 from August 2021, but this time it delivered IcedID instead of BazarLoader. Associated malware: SHA256 hash: d68fb04c96e925efcdb3484669365bed0cda22a272e486e99a43f9626019d31c File size: 38,958 bytes File name: request.zip File description: Password-protected zip archive attached to email Password: 55egs SHA256 hash: 0a42f6762ae4f3b1d95aae0f8977cde6361f1d59b5ccc400c41772db0205f7c5 File size: 34,322 bytes File name: charge_12.01.2021.doc File description: Word doc with macros for IcedID SHA256 hash: c7f40608ce8a3dda25c13d117790d08ef757b07b8c2ccb645a27a71adc322fb2 File size: 3,342 bytes File location: C:\Users\[username]\Documents\youTube.hta File description: HTA file dropped after enabling Word macros SHA256 hash: d54a870ba5656c5d3ddfab5f7f325c2fb8ee256b25e2872847c5ff244bc6ee6e File size: 257,672 bytes File location: hxxp://winrentals2017b[.]com/tegz/[long string of characters]/cab3?ref=[long string of characters] File location: C:\Users\Public\dowNext.jpg File description: Installer DLL for IcedID Run method: regsvr32.exe [filename] SHA256 hash: cfc202b44509f2f607d365858a8218dfdc6b26f8087efcc5e46f4fef9ab53705 File size: 341,898 bytes File location: C:\Users\[username]\AppData\Roaming\ReliefEight\license.dat File description: license.dat data binary used to run persistent IcedID DLL SHA256 hash: c340ae2dde2bd8fbae46b15abef0c7e706fe8953c837329bde409959836d6510 File size: 116,224 bytes File location: C:\Users\[username]\AppData\Roaming\{24DB904E-86F7-2F2C-B7C1-85D8BBCE1181}\Miap\Giowcosi64.dll File description: persistent IcedID DLL Run method: rundll32.exe [filename],DllMain --giqied="[path to license.dat]" IcedID traffic: 143.204.155[.]37 port 443 - aws.amazon[.]com - HTTPS traffic 87.120.254[.]190 port 80 - normyils[.]com - GET / HTTP/1.1 87.120.8[.]98 port 443 - baeswea[.]com - HTTPS traffic 91.92.109[.]95 port 443 - bersaww[.]com - HTTPS traffic Final words IcedID can be followed by Cobalt Strike when an infected host is part of an Active Directory (AD) environment. These types of infections can deliver ransomware as a final payload in real-world environments. But decent spam filters and best security practices can help you avoid IcedID. Default security settings in Windows 10 and Microsoft Office 2019 should prevent these types of infections from happening. --- Brad Duncan brad [at] malware-traffic-analysis.net	Brad 435 Posts ISC Handler Dec 3rd 2021
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