Analysis
- max time kernel
150s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
12/03/2024, 19:10
General
- Target 671fc7acb0f580ff3a30e09ebeee1e3205aa9a446f75616b542fbd0a3aa1b120.exe
- Size 2.0MB
- Sample240312-xvcbpsbb37
- SHA256 671fc7acb0f580ff3a30e09ebeee1e3205aa9a446f75616b542fbd0a3aa1b120
Malware Config
Extracted
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stealc
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http://185.172.128.145
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url_path
/3cd2b41cbde8fc9c.php
Signatures
- Stealc
Stealc is an infostealer written in C++.
- Downloads MZ/PE file
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 3 IoCs
- Loads dropped DLL 5 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.
- UPX packed file 3 IoCs
Detects executables packed with UPX/modified UPX open source packer.
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Adds Run key to start application 2 TTPs 1 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- 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).
- Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
- 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 53 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 27 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\671fc7acb0f580ff3a30e09ebeee1e3205aa9a446f75616b542fbd0a3aa1b120.exe"C:\Users\Admin\AppData\Local\Temp\671fc7acb0f580ff3a30e09ebeee1e3205aa9a446f75616b542fbd0a3aa1b120.exe"1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\syncUpd.exeC:\Users\Admin\AppData\Local\Temp\syncUpd.exe2⤵
- Checks computer location settings
- Executes dropped EXE
- 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 start "" "C:\Users\Admin\AppData\Local\Temp\IEBFIEBAFC.exe"3⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\IEBFIEBAFC.exe"C:\Users\Admin\AppData\Local\Temp\IEBFIEBAFC.exe"4⤵
- Checks computer location settings
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /C ping 2.2.2.2 -n 1 -w 3000 > Nul & Del C:\Users\Admin\AppData\Local\Temp\IEBFIEBAFC.exe5⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\PING.EXEping 2.2.2.2 -n 1 -w 30006⤵
- Runs ping.exe
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C:\Users\Admin\AppData\Local\Temp\BroomSetup.exeC:\Users\Admin\AppData\Local\Temp\BroomSetup.exe2⤵
- Executes dropped EXE
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\Temp\Task.bat" "3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\chcp.comchcp 12514⤵
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C:\Windows\SysWOW64\schtasks.exeschtasks /create /tn "MalayamaraUpdate" /tr "'C:\Users\Admin\AppData\Local\Temp\Updater.exe'" /sc minute /mo 30 /F4⤵
- Creates scheduled task(s)
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
Are.docx
mozglue.dll
nss3.dll
BroomSetup.exe
IEBFIEBAFC.exe
INetC.dll
syncUpd.exe
Task.bat
memory/1408-35-0x0000000000400000-0x000000000043D000-memory.dmp
memory/3576-164-0x0000000004C60000-0x0000000004C70000-memory.dmp
memory/3576-163-0x0000000074A30000-0x00000000751E0000-memory.dmp
memory/3576-162-0x00000000000C0000-0x00000000000DE000-memory.dmp
memory/3604-37-0x00000000027F0000-0x00000000027F1000-memory.dmp
memory/3604-81-0x0000000000400000-0x0000000000930000-memory.dmp
memory/3604-36-0x0000000000400000-0x0000000000930000-memory.dmp
memory/3604-94-0x00000000027F0000-0x00000000027F1000-memory.dmp
memory/4284-86-0x0000000000710000-0x0000000000810000-memory.dmp
memory/4284-100-0x0000000000400000-0x000000000063B000-memory.dmp
memory/4284-95-0x0000000000400000-0x000000000063B000-memory.dmp
memory/4284-85-0x0000000000400000-0x000000000063B000-memory.dmp
memory/4284-122-0x0000000000400000-0x000000000063B000-memory.dmp
memory/4284-133-0x0000000000400000-0x000000000063B000-memory.dmp
memory/4284-80-0x0000000000400000-0x000000000063B000-memory.dmp
memory/4284-148-0x0000000000400000-0x000000000063B000-memory.dmp
memory/4284-157-0x0000000000400000-0x000000000063B000-memory.dmp
memory/4284-41-0x0000000061E00000-0x0000000061EF3000-memory.dmp
memory/4284-23-0x0000000000400000-0x000000000063B000-memory.dmp
memory/4284-22-0x00000000008A0000-0x00000000008C7000-memory.dmp
memory/4284-21-0x0000000000710000-0x0000000000810000-memory.dmp