Resubmissions
10/04/2024, 02:38
240410-c4pceacb241010/04/2024, 02:37
240410-c4ne4scb231010/04/2024, 02:37
240410-c4llhsca991010/04/2024, 02:37
240410-c4jf6aca981014/10/2023, 01:31
231014-bxezqahg8w10Analysis
- max time kernel
195s - max time network
299s - platform
windows10-1703_x64 - resource
win10-20240404-en - resource tags
- submitted
10/04/2024, 02:37
General
- Target k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
- Size 339KB
- Sample240410-c4jf6aca98
- SHA256 d71329c78c704ee9cc7133761b5e738a315e7eb784e348d7743a8a7366724e9f
Malware Config
Extracted
-
gurcu
-
https://api.telegram.org/bot6193093056:AAHzyNGUGS9aUG6CCx6ENLoXpCFLzEQywIQ/sendMessage?chat_id=1098292643
Signatures
- Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
- Executes dropped EXE 2 IoCs
- Reads WinSCP keys stored on the system 2 TTPs
Tries to access WinSCP stored sessions.
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses Microsoft Outlook profiles 1 TTPs 6 IoCs
- Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Runs ping.exe 1 TTPs 1 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of WriteProcessMemory 10 IoCs
- Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
- outlook_office_path 1 IoCs
- outlook_win_path 1 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe"C:\Users\Admin\AppData\Local\Temp\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "k2fef4820980d3c2c1f2cce2f95e94f5e1c18" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe"2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\chcp.comchcp 650013⤵
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C:\Windows\system32\PING.EXEping 127.0.0.13⤵
- Runs ping.exe
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C:\Windows\system32\schtasks.exeschtasks /create /tn "k2fef4820980d3c2c1f2cce2f95e94f5e1c18" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe"C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe"3⤵
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exeC:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe1⤵
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe.log
k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
port.dat
memory/204-16-0x0000017018B00000-0x0000017018B10000-memory.dmp
memory/204-11-0x00007FFC02D80000-0x00007FFC0376C000-memory.dmp
memory/204-12-0x0000017018B00000-0x0000017018B10000-memory.dmp
memory/204-15-0x00007FFC02D80000-0x00007FFC0376C000-memory.dmp
memory/2596-18-0x00007FFC02D80000-0x00007FFC0376C000-memory.dmp
memory/2596-19-0x0000022692480000-0x0000022692490000-memory.dmp
memory/2596-22-0x00007FFC02D80000-0x00007FFC0376C000-memory.dmp
memory/2596-23-0x0000022692480000-0x0000022692490000-memory.dmp
memory/2872-6-0x00007FFC02D80000-0x00007FFC0376C000-memory.dmp
memory/2872-2-0x0000024D22F40000-0x0000024D22F50000-memory.dmp
memory/2872-0-0x0000024D08810000-0x0000024D0886C000-memory.dmp
memory/2872-1-0x00007FFC02D80000-0x00007FFC0376C000-memory.dmp