Analysis
- max time kernel
152s - max time network
158s - platform
windows10-2004_x64 - resource
win10v2004-20220414-en - submitted
21/05/2022, 11:58
General
- Target PO#Ref49038.scr
- Size 927KB
- Sample220521-n5hf2aefd7
- SHA256 bc9ef35a37d74aeb04bb1140314db0fca3f09fe2657e987cd8aaa9e4f234b991
Malware Config
Extracted
-
C:\Users\Admin\AppData\Local\Temp\8236ADF044\Log.txt
-
masslogger
- ################################################################# MassLogger v1.3.7.0 ################################################################# ### Logger Details ### User Name: Admin IP: 127.0.0.1 Location: United States Windows OS: Microsoft Windows 10 Pro64bit Windows Serial Key: W269N-WFGWX-YVC9B-4J6C9-T83GX CPU: Intel Core Processor (Broadwell) GPU: Microsoft Basic Display Adapter AV: NA Screen Resolution: 1280x720 Current Time: 5/21/2022 2:54:42 PM MassLogger Started: 5/21/2022 2:54:29 PM Interval: 2 hour MassLogger Process: C:\Users\Admin\AppData\Local\Temp\PO#Ref49038.scr MassLogger Melt: false MassLogger Exit after delivery: false As Administrator: True Processes:
Signatures
- MassLogger
Masslogger is a .NET stealer targeting passwords from browsers, email and cryptocurrency clients.
- MassLogger Main Payload 1 IoCs
- MassLogger log file 1 IoCs
Detects a log file produced by MassLogger.
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- 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 18 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.
- Suspicious use of SetThreadContext 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: AddClipboardFormatListener 1 IoCs
- Suspicious behavior: EnumeratesProcesses 8 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 14 IoCs
- outlook_office_path 1 IoCs
- outlook_win_path 1 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\PO#Ref49038.scr"C:\Users\Admin\AppData\Local\Temp\PO#Ref49038.scr" /S1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\XsfZPhAnS" /XML "C:\Users\Admin\AppData\Local\Temp\tmpF28E.tmp"2⤵
- Creates scheduled task(s)
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C:\Users\Admin\AppData\Local\Temp\PO#Ref49038.scr"{path}"2⤵
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C:\Users\Admin\AppData\Local\Temp\PO#Ref49038.scr"{path}"2⤵
- Checks computer location settings
- Accesses Microsoft Outlook profiles
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- outlook_office_path
- outlook_win_path
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
tmpF28E.tmp
memory/2764-130-0x00000000001F0000-0x00000000002E2000-memory.dmp
memory/2764-131-0x000000000AC20000-0x000000000B1C4000-memory.dmp
memory/2764-132-0x000000000A670000-0x000000000A702000-memory.dmp
memory/2764-133-0x000000000A7B0000-0x000000000A84C000-memory.dmp
memory/3132-138-0x0000000000400000-0x00000000004A8000-memory.dmp
memory/3132-139-0x0000000005660000-0x00000000056C6000-memory.dmp
memory/3132-140-0x0000000007230000-0x000000000723A000-memory.dmp
memory/3132-141-0x0000000007D50000-0x0000000007DA0000-memory.dmp