Resubmissions
10/04/2024, 02:45
240410-c88xlscb891010/04/2024, 02:45
240410-c88a3scb881010/04/2024, 02:45
240410-c8631scb861010/04/2024, 02:45
240410-c86ggscb851014/10/2023, 02:07
231014-cj7cgsba8110Analysis
- max time kernel
791s - max time network
867s - platform
windows10-1703_x64 - resource
win10-20240404-en - resource tags
- submitted
10/04/2024, 02:45
General
- Target I63f8affb2294c837814c33f5446924ba.exe
- Size 89KB
- Sample240410-c88a3scb88
- SHA256 2d1765fd2323db0b7a1b2a4413f793bb6b3a544ed7ba19c1b0d9c4db80747a93
Malware Config
Signatures
- Detect Gurcu Stealer V3 payload 2 IoCs
- 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 behavior: EnumeratesProcesses 2 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\I63f8affb2294c837814c33f5446924ba.exe"C:\Users\Admin\AppData\Local\Temp\I63f8affb2294c837814c33f5446924ba.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 "I63f8affb2294c837814c33f5446924ba" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\I63f8affb2294c837814c33f5446924ba.exe" &&START "" "C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.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 "I63f8affb2294c837814c33f5446924ba" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe"C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe"3⤵
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exeC:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe1⤵
- Executes dropped EXE
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
I63f8affb2294c837814c33f5446924ba.exe
I63f8affb2294c837814c33f5446924ba.exe.log
installUtilLog.txt
port.dat
memory/1308-19-0x00007FF8922E0000-0x00007FF892CCC000-memory.dmp
memory/1308-20-0x00000181D0760000-0x00000181D0770000-memory.dmp
memory/1308-25-0x00007FF8922E0000-0x00007FF892CCC000-memory.dmp
memory/1308-26-0x00000181D0760000-0x00000181D0770000-memory.dmp
memory/1312-11-0x00007FF8922E0000-0x00007FF892CCC000-memory.dmp
memory/1312-12-0x0000010377A00000-0x0000010377A10000-memory.dmp
memory/1312-16-0x00007FF8922E0000-0x00007FF892CCC000-memory.dmp
memory/1312-17-0x0000010377A00000-0x0000010377A10000-memory.dmp
memory/1396-6-0x00007FF8922E0000-0x00007FF892CCC000-memory.dmp
memory/1396-2-0x000001D0E5B70000-0x000001D0E5B80000-memory.dmp
memory/1396-0-0x000001D0CB620000-0x000001D0CB63C000-memory.dmp
memory/1396-1-0x00007FF8922E0000-0x00007FF892CCC000-memory.dmp