Analysis
- max time kernel
135s - max time network
153s - platform
windows10-2004_x64 - resource
win10v2004-20230221-en - resource tags
- submitted
11/05/2023, 12:48
General
- Target Understregninger.exe
- Size 322KB
- Sample230511-p1rdtadd28
- SHA256 f8082dc1210616c55008edc73e1ca4966cd8575e2425ed72f71f28b97f71172a
Malware Config
Extracted
-
agenttesla
-
https://api.telegram.org/bot6168599451:AAGNek51QMYNhL09hhnCcUs8a_1nMuD4d9s/
Signatures
- AgentTesla
Agent Tesla is a remote access tool (RAT) written in visual basic.
- Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
- Checks QEMU agent file 2 TTPs 2 IoCs
Checks presence of QEMU agent, possibly to detect virtualization.
- Loads dropped DLL 1 IoCs
- Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs
- Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs
- Suspicious use of SetThreadContext 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Program crash 1 IoCs
- Suspicious behavior: MapViewOfSection 1 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 4 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\Understregninger.exe"C:\Users\Admin\AppData\Local\Temp\Understregninger.exe"1⤵
- Checks QEMU agent file
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
-
C:\Windows\Microsoft.NET\Framework\v4.0.30319\caspol.exe"C:\Users\Admin\AppData\Local\Temp\Understregninger.exe"2⤵
- Checks QEMU agent file
- Suspicious use of NtCreateThreadExHideFromDebugger
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of AdjustPrivilegeToken
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 1152 -s 21643⤵
- Program crash
-
-
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 1152 -ip 11521⤵
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
System.dll
memory/1152-173-0x00000000013B0000-0x0000000003568000-memory.dmp
memory/1152-164-0x00000000013B0000-0x0000000003568000-memory.dmp
memory/1152-165-0x00000000013B0000-0x0000000003568000-memory.dmp
memory/1152-172-0x0000000000400000-0x000000000062B000-memory.dmp
memory/1152-174-0x0000000000400000-0x0000000000430000-memory.dmp
memory/1152-175-0x0000000036A30000-0x0000000036FD4000-memory.dmp
memory/1152-176-0x0000000001310000-0x0000000001376000-memory.dmp
memory/1152-177-0x0000000036560000-0x0000000036570000-memory.dmp
memory/1152-179-0x0000000037480000-0x0000000037512000-memory.dmp
memory/1152-180-0x0000000037420000-0x000000003742A000-memory.dmp
memory/1152-181-0x00000000013B0000-0x0000000003568000-memory.dmp
memory/4484-163-0x00000000044E0000-0x0000000006698000-memory.dmp
memory/4484-162-0x00000000044E0000-0x0000000006698000-memory.dmp