remcos | f19b2e31a0bc55cb5d4ab540605cfeffca6dd241cbe4e96e065d403a7273534a

Analysis

max time kernel
74s
max time network
157s
platform
windows10_x64
resource
win10v20210408
submitted
01/07/2021, 07:03

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General

Target
2941c871eb1612be073828fa369a03c6.exe
Size 641KB
Sample210701-j8gepczyk6
SHA256 f19b2e31a0bc55cb5d4ab540605cfeffca6dd241cbe4e96e065d403a7273534a
MD5 2941c871eb1612be073828fa369a03c6
SHA1 8a4cc7f0dfdbd9edc94f2e08e485f876980f808e
SHA512 8290aa1c1cf824ce0438f80b4fefe570b787d64f468ce850bbfcfd8fd35270149ef88c17d0b6575607663f9872c382d30955df685e9cad27843e875a4f63cccc
MD5 SHA1 SHA512

Score

10^/10

remcos host persistence rat

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

KJJJK.3dxtras.com:7003

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
EXCEL.exe
copy_folder
remcos
delete_file
false
hide_file
true
hide_keylog_file
false
install_flag
true
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
remcos_gjflhbdwwk
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
chrome
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

Executes dropped EXE 3 IoCs

pid	Process
3044	EXCEL.exe
2784	EXCEL.exe
3476	EXCEL.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\	2941c871eb1612be073828fa369a03c6.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\chrome = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\EXCEL.exe\""	2941c871eb1612be073828fa369a03c6.exe
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\	EXCEL.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\chrome = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\EXCEL.exe\""	EXCEL.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3008 set thread context of 1324	3008	2941c871eb1612be073828fa369a03c6.exe	78
PID 3044 set thread context of 3476	3044	EXCEL.exe	84

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

System Information Discovery
T1082

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2388	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3044	EXCEL.exe
3044	EXCEL.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3044	EXCEL.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3476	EXCEL.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 3008 wrote to memory of 1324	3008	2941c871eb1612be073828fa369a03c6.exe	78
PID 3008 wrote to memory of 1324	3008	2941c871eb1612be073828fa369a03c6.exe	78
PID 3008 wrote to memory of 1324	3008	2941c871eb1612be073828fa369a03c6.exe	78
PID 3008 wrote to memory of 1324	3008	2941c871eb1612be073828fa369a03c6.exe	78
PID 3008 wrote to memory of 1324	3008	2941c871eb1612be073828fa369a03c6.exe	78
PID 3008 wrote to memory of 1324	3008	2941c871eb1612be073828fa369a03c6.exe	78
PID 3008 wrote to memory of 1324	3008	2941c871eb1612be073828fa369a03c6.exe	78
PID 3008 wrote to memory of 1324	3008	2941c871eb1612be073828fa369a03c6.exe	78
PID 3008 wrote to memory of 1324	3008	2941c871eb1612be073828fa369a03c6.exe	78
PID 1324 wrote to memory of 3668	1324	2941c871eb1612be073828fa369a03c6.exe	79
PID 1324 wrote to memory of 3668	1324	2941c871eb1612be073828fa369a03c6.exe	79
PID 1324 wrote to memory of 3668	1324	2941c871eb1612be073828fa369a03c6.exe	79
PID 3668 wrote to memory of 2388	3668	cmd.exe	81
PID 3668 wrote to memory of 2388	3668	cmd.exe	81
PID 3668 wrote to memory of 2388	3668	cmd.exe	81
PID 3668 wrote to memory of 3044	3668	cmd.exe	82
PID 3668 wrote to memory of 3044	3668	cmd.exe	82
PID 3668 wrote to memory of 3044	3668	cmd.exe	82
PID 3044 wrote to memory of 2784	3044	EXCEL.exe	83
PID 3044 wrote to memory of 2784	3044	EXCEL.exe	83
PID 3044 wrote to memory of 2784	3044	EXCEL.exe	83
PID 3044 wrote to memory of 3476	3044	EXCEL.exe	84
PID 3044 wrote to memory of 3476	3044	EXCEL.exe	84
PID 3044 wrote to memory of 3476	3044	EXCEL.exe	84
PID 3044 wrote to memory of 3476	3044	EXCEL.exe	84
PID 3044 wrote to memory of 3476	3044	EXCEL.exe	84
PID 3044 wrote to memory of 3476	3044	EXCEL.exe	84
PID 3044 wrote to memory of 3476	3044	EXCEL.exe	84
PID 3044 wrote to memory of 3476	3044	EXCEL.exe	84
PID 3044 wrote to memory of 3476	3044	EXCEL.exe	84

C:\Users\Admin\AppData\Local\Temp\2941c871eb1612be073828fa369a03c6.exe
"C:\Users\Admin\AppData\Local\Temp\2941c871eb1612be073828fa369a03c6.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3008
- C:\Users\Admin\AppData\Local\Temp\2941c871eb1612be073828fa369a03c6.exe
  "{path}"
  2⤵
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:1324
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3668
  - - C:\Windows\SysWOW64\PING.EXE
      PING 127.0.0.1 -n 2
      4⤵
      Runs ping.exe
      PID:2388
  - - C:\Users\Admin\AppData\Roaming\remcos\EXCEL.exe
      "C:\Users\Admin\AppData\Roaming\remcos\EXCEL.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:3044
    - - C:\Users\Admin\AppData\Roaming\remcos\EXCEL.exe
        
        "{path}"
        5⤵
        Executes dropped EXE
        
        PID:2784
    - - C:\Users\Admin\AppData\Roaming\remcos\EXCEL.exe
        
        "{path}"
        5⤵
        Executes dropped EXE
        Adds Run key to start application
        Suspicious use of SetWindowsHookEx
        
        PID:3476

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/1324-124-0x0000000000400000-0x0000000000417000-memory.dmp

Download

memory/1324-126-0x0000000000400000-0x0000000000417000-memory.dmp

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memory/3008-120-0x0000000007A00000-0x0000000007A01000-memory.dmp

Download

memory/3008-119-0x00000000057D0000-0x0000000005862000-memory.dmp

Download

memory/3008-122-0x0000000007F80000-0x0000000008021000-memory.dmp

Download

memory/3008-116-0x0000000005D90000-0x0000000005D91000-memory.dmp

Download

memory/3008-121-0x0000000005D80000-0x0000000005D82000-memory.dmp

Download

memory/3008-114-0x0000000000E50000-0x0000000000E51000-memory.dmp

Download

memory/3008-117-0x0000000005890000-0x0000000005891000-memory.dmp

Download

memory/3008-123-0x000000000A670000-0x000000000A6C7000-memory.dmp

Download

memory/3008-118-0x00000000059D0000-0x00000000059D1000-memory.dmp

Download

memory/3044-140-0x00000000050C0000-0x00000000055BE000-memory.dmp

Download

memory/3476-147-0x0000000000400000-0x0000000000417000-memory.dmp

Download