Analysis
- max time kernel
147s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
26/12/2023, 14:05
General
- Target 4fba79b2f5bb7a1670e6d0bfa4b663a7.exe
- Size 280KB
- Sample231226-rdt8asecd8
- SHA256 15cdd7b6d90535beeda078d371f868380127c99bfe8e0122201a0ea7b8a2959f
Malware Config
Extracted
-
stealc
-
http://5.42.66.58
-
url_path
/3886d2276f6914c4.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 WriteProcessMemory 6 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\4fba79b2f5bb7a1670e6d0bfa4b663a7.exe"C:\Users\Admin\AppData\Local\Temp\4fba79b2f5bb7a1670e6d0bfa4b663a7.exe"1⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\4fba79b2f5bb7a1670e6d0bfa4b663a7.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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-
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 816 -s 23882⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 816 -ip 8161⤵
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
mozglue.dll
mozglue.dll
nss3.dll
memory/816-1-0x0000000000810000-0x0000000000910000-memory.dmp
memory/816-2-0x00000000007A0000-0x00000000007BC000-memory.dmp
memory/816-3-0x0000000000400000-0x000000000062E000-memory.dmp
memory/816-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp
memory/816-75-0x0000000000400000-0x000000000062E000-memory.dmp
memory/816-76-0x0000000000810000-0x0000000000910000-memory.dmp
memory/816-84-0x0000000000400000-0x000000000062E000-memory.dmp
memory/816-90-0x0000000000400000-0x000000000062E000-memory.dmp
memory/816-92-0x0000000000400000-0x000000000062E000-memory.dmp