remcos | e391c863171dbe0a79e9ee01b3f221603e1dddb3938c3215980cd5b991578f4e

General

Target
4bbf2d108f7e10872a657f7395a09eeb.exe
Size 1.1MB
Sample210810-e79tkl16kj
SHA256 e391c863171dbe0a79e9ee01b3f221603e1dddb3938c3215980cd5b991578f4e
MD5 4bbf2d108f7e10872a657f7395a09eeb
SHA1 d895820ac1631c9de8b6561aa9cf39099fb2407a
SHA512 42f9b1b755a599a0a9dd870b00791bc7c8e85519909929910e272eae432865942b746ab0bde29af078aba9d20c2211f69fd25f78bfaed034a6ff22249de82082
MD5 SHA1 SHA512

Score

10^/10

remcos remotehost evasion rat

Malware Config

Extracted

Family

remcos

Version

3.2.0 Pro

Botnet

RemoteHost

C2

45.137.22.101:5888

Attributes

audio_folder
MicRecords
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
Remcos-3RVIAE
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Remcos
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
notepad;solitaire;

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Looks for VirtualBox Guest Additions in registry 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497
Looks for VMWare Tools registry key 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	4bbf2d108f7e10872a657f7395a09eeb.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	4bbf2d108f7e10872a657f7395a09eeb.exe

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	4bbf2d108f7e10872a657f7395a09eeb.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	4bbf2d108f7e10872a657f7395a09eeb.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1644 set thread context of 516	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	32

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
536	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1644	4bbf2d108f7e10872a657f7395a09eeb.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1644	4bbf2d108f7e10872a657f7395a09eeb.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 1644 wrote to memory of 536	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	30
PID 1644 wrote to memory of 536	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	30
PID 1644 wrote to memory of 536	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	30
PID 1644 wrote to memory of 536	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	30
PID 1644 wrote to memory of 516	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	32
PID 1644 wrote to memory of 516	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	32
PID 1644 wrote to memory of 516	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	32
PID 1644 wrote to memory of 516	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	32
PID 1644 wrote to memory of 516	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	32
PID 1644 wrote to memory of 516	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	32
PID 1644 wrote to memory of 516	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	32
PID 1644 wrote to memory of 516	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	32
PID 1644 wrote to memory of 516	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	32
PID 1644 wrote to memory of 516	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	32
PID 1644 wrote to memory of 516	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	32
PID 1644 wrote to memory of 516	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	32
PID 1644 wrote to memory of 516	1644	4bbf2d108f7e10872a657f7395a09eeb.exe	32

C:\Users\Admin\AppData\Local\Temp\4bbf2d108f7e10872a657f7395a09eeb.exe
"C:\Users\Admin\AppData\Local\Temp\4bbf2d108f7e10872a657f7395a09eeb.exe"
1⤵
- Checks BIOS information in registry
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1644
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\kzqTuNuE" /XML "C:\Users\Admin\AppData\Local\Temp\tmp671C.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:536
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe"
  2⤵
  PID:516