Analysis
- max time kernel
149s - max time network
157s - platform
windows10-2004_x64 - resource
win10v2004-20240508-en - resource tags
- submitted
14/05/2024, 01:05
General
- Target 1b8bf6014500f3f82fdb14a87fdebaeb0bfe707983e4d810a1012f62ed03135c.exe
- Size 819KB
- Sample240514-bfzb2add95
- SHA256 1b8bf6014500f3f82fdb14a87fdebaeb0bfe707983e4d810a1012f62ed03135c
Malware Config
Extracted
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remcos
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RemoteHost
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jazts.duckdns.org:2404
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audio_folder
MicRecords
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audio_record_time
5
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connect_delay
0
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connect_interval
1
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copy_file
remcos.exe
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copy_folder
Remcos
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delete_file
false
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hide_file
false
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hide_keylog_file
false
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install_flag
true
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keylog_crypt
false
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keylog_file
logs.dat
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keylog_flag
false
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keylog_folder
remcos
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mouse_option
false
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mutex
Rmc-AX5VVU
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screenshot_crypt
false
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screenshot_flag
false
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screenshot_folder
Screenshots
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screenshot_path
%AppData%
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screenshot_time
10
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take_screenshot_option
false
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take_screenshot_time
5
Signatures
- Remcos
Remcos is a closed-source remote control and surveillance software.
- Detects Windows exceutables bypassing UAC using CMSTP COM interfaces. MITRE (T1218.003) 19 IoCs
- Detects executables built or packed with MPress PE compressor 16 IoCs
- Detects executables referencing many confidential data stores found in browsers, mail clients, cryptocurreny wallets, etc. Observed in information stealers 2 IoCs
- Detects executables referencing many email and collaboration clients. Observed in information stealers 2 IoCs
- NirSoft MailPassView 2 IoCs
Password recovery tool for various email clients
- NirSoft WebBrowserPassView 3 IoCs
Password recovery tool for various web browsers
- Nirsoft 7 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 4 IoCs
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs
- Adds Run key to start application 2 TTPs 5 IoCs
- Suspicious use of SetThreadContext 3 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Script User-Agent 4 IoCs
Uses user-agent string associated with script host/environment.
- Suspicious behavior: EnumeratesProcesses 6 IoCs
- Suspicious behavior: MapViewOfSection 3 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 15 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\1b8bf6014500f3f82fdb14a87fdebaeb0bfe707983e4d810a1012f62ed03135c.exe"C:\Users\Admin\AppData\Local\Temp\1b8bf6014500f3f82fdb14a87fdebaeb0bfe707983e4d810a1012f62ed03135c.exe"1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\extrac32.exeC:\\Windows\\System32\\extrac32.exe /C /Y C:\Users\Admin\AppData\Local\Temp\1b8bf6014500f3f82fdb14a87fdebaeb0bfe707983e4d810a1012f62ed03135c.exe C:\\Users\\Public\\Libraries\\Odffsday.PIF2⤵
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C:\ProgramData\Remcos\remcos.exe"C:\ProgramData\Remcos\remcos.exe"2⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\ProgramData\Remcos\remcos.exeC:\ProgramData\Remcos\remcos.exe /stext "C:\Users\Admin\AppData\Local\Temp\wwxsxekryqkgedlduhvzyiyg"3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
-
-
C:\ProgramData\Remcos\remcos.exeC:\ProgramData\Remcos\remcos.exe /stext "C:\Users\Admin\AppData\Local\Temp\zycdyxvsmyclgjhhdrhajnsxdapj"3⤵
- Executes dropped EXE
- Accesses Microsoft Outlook accounts
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-
C:\ProgramData\Remcos\remcos.exeC:\ProgramData\Remcos\remcos.exe /stext "C:\Users\Admin\AppData\Local\Temp\jsqvypfmaguqqxvlucuumaffmohsnfw"3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
logs.dat
remcos.exe
wwxsxekryqkgedlduhvzyiyg
memory/1392-37-0x0000000000400000-0x0000000000478000-memory.dmp
memory/1392-55-0x0000000000400000-0x0000000000478000-memory.dmp
memory/1392-33-0x0000000000400000-0x0000000000478000-memory.dmp
memory/1392-35-0x0000000000400000-0x0000000000478000-memory.dmp
memory/1392-36-0x0000000000400000-0x0000000000478000-memory.dmp
memory/2440-48-0x0000000000400000-0x0000000000424000-memory.dmp
memory/2440-46-0x0000000000400000-0x0000000000424000-memory.dmp
memory/2440-49-0x0000000000400000-0x0000000000424000-memory.dmp
memory/2440-52-0x0000000000400000-0x0000000000424000-memory.dmp
memory/3000-38-0x0000000000400000-0x0000000000462000-memory.dmp
memory/3000-40-0x0000000000400000-0x0000000000462000-memory.dmp
memory/3000-45-0x0000000000400000-0x0000000000462000-memory.dmp
memory/3000-41-0x0000000000400000-0x0000000000462000-memory.dmp
memory/3504-21-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-58-0x000000004BCD0000-0x000000004BCE9000-memory.dmp
memory/3504-30-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-29-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-105-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-27-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-25-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-24-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-23-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-22-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-20-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-17-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-16-0x0000000000400000-0x00000000004D5000-memory.dmp
memory/3504-31-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-15-0x00000000023D0000-0x00000000023D1000-memory.dmp
memory/3504-62-0x000000004BCD0000-0x000000004BCE9000-memory.dmp
memory/3504-61-0x000000004BCD0000-0x000000004BCE9000-memory.dmp
memory/3504-63-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-66-0x00000000023D0000-0x00000000023D1000-memory.dmp
memory/3504-104-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-71-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-72-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-82-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-93-0x000000002D550000-0x000000002E550000-memory.dmp
memory/3504-94-0x000000002D550000-0x000000002E550000-memory.dmp
memory/4320-1-0x0000000000400000-0x00000000004D5000-memory.dmp
memory/4320-0-0x00000000023D0000-0x00000000023D1000-memory.dmp