Analysis
- max time kernel
140s - max time network
148s - platform
windows10-2004_x64 - resource
win10v2004-20231201-en - resource tags
- submitted
09/12/2023, 04:08
General
- Target file.exe
- Size 221KB
- Sample231209-ep8tlseefj
- SHA256 c56054ea9722cafa3efba8b48aa2d4ee1d2ce2836df71a4842a45c210cfa080a
Malware Config
Extracted
-
stealc
-
http://5.42.64.41
-
url_path
/40d570f44e84a454.php
Signatures
- Stealc
Stealc is an infostealer written in C++.
- Downloads MZ/PE file
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Loads dropped DLL 2 IoCs
- Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Program crash 1 IoCs
- Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
- Delays execution with timeout.exe 1 IoCs
- Suspicious behavior: EnumeratesProcesses 2 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\file.exe" & del "C:\ProgramData\*.dll"" & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\timeout.exetimeout /t 53⤵
- Delays execution with timeout.exe
-
-
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 1692 -s 24042⤵
- Program crash
-
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 1692 -ip 16921⤵
-
C:\Windows\system32\rundll32.exe"C:\Windows\system32\rundll32.exe" "C:\Windows\SYSTEM32\EDGEHTML.dll",#141 Microsoft.VCLibs.140.00_8wekyb3d8bbwe1⤵
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C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k UnistackSvcGroup1⤵
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Are.docx
mozglue.dll
mozglue.dll
nss3.dll
memory/392-122-0x000001FFFDEB0000-0x000001FFFDEB1000-memory.dmp
memory/392-90-0x000001FFF5A40000-0x000001FFF5A50000-memory.dmp
memory/392-106-0x000001FFF5B40000-0x000001FFF5B50000-memory.dmp
memory/392-124-0x000001FFFDEE0000-0x000001FFFDEE1000-memory.dmp
memory/392-125-0x000001FFFDEE0000-0x000001FFFDEE1000-memory.dmp
memory/392-126-0x000001FFFDFF0000-0x000001FFFDFF1000-memory.dmp
memory/1692-52-0x0000000000400000-0x000000000085B000-memory.dmp
memory/1692-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp
memory/1692-3-0x0000000000400000-0x000000000085B000-memory.dmp
memory/1692-2-0x0000000002590000-0x00000000025AC000-memory.dmp
memory/1692-89-0x0000000000400000-0x000000000085B000-memory.dmp
memory/1692-1-0x0000000000880000-0x0000000000980000-memory.dmp