remcos | b571adb0b22f7874af6676b62d578b0161f714f1ee65d992272463f82847dba3

Analysis

max time kernel
148s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
30/05/2024, 01:29

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General

Target

Mtn03 Credit Receipt Jpg.exe
Size

519KB
MD5

c39c874e0184d91e2a9ca393c919bac3
SHA1

2ce663a89bf9b7f2dbb8f847585bebd60cee52c7
SHA256

86b29c8b17f5e01fe26349520452e9cf853cfb816ef46f37b071f02b7d96d603
SHA512

8ce86457420fef18bb56c86c8af629752ab652ff45332799e8c4b39e856b209a64f9d9024be21da86f1288767e5dcf4ab41ca8cfc6f6f12f20d2419a92c5a91e
SSDEEP

12288:ivNVAT3iHR0R3ZvDSQJZTebqRkTsekknxN:AVgyHR0TvOQJkma/N

Score

10^/10

remcos host persistence rat

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

william2243.duckdns.org:1598

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
remcos.exe
copy_folder
remcos
delete_file
false
hide_file
false
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_pdaejuprezbgooi
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
remcos
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

detects Windows exceutables potentially bypassing UAC using eventvwr.exe 7 IoCs

resource	yara_rule
behavioral2/memory/3348-12-0x0000000000400000-0x0000000000417000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
behavioral2/memory/3348-15-0x0000000000400000-0x0000000000417000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
behavioral2/memory/3348-16-0x0000000000400000-0x0000000000417000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
behavioral2/memory/3348-22-0x0000000000400000-0x0000000000417000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
behavioral2/memory/1720-32-0x0000000000400000-0x0000000000417000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
behavioral2/memory/1720-33-0x0000000000400000-0x0000000000417000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
behavioral2/memory/1720-34-0x0000000000400000-0x0000000000417000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1162180587-977231257-2194346871-1000\Control Panel\International\Geo\Nation	Mtn03 Credit Receipt Jpg.exe

Executes dropped EXE 2 IoCs

pid	Process
1420	remcos.exe
1720	remcos.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1162180587-977231257-2194346871-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	Mtn03 Credit Receipt Jpg.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1162180587-977231257-2194346871-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\remcos.exe\""	remcos.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4136 set thread context of 3348	4136	Mtn03 Credit Receipt Jpg.exe	92
PID 1420 set thread context of 1720	1420	remcos.exe	97

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

System Information Discovery
T1082

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
3524	PING.EXE

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1720	remcos.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1720	remcos.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1720	remcos.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 4136 wrote to memory of 3348	4136	Mtn03 Credit Receipt Jpg.exe	92
PID 4136 wrote to memory of 3348	4136	Mtn03 Credit Receipt Jpg.exe	92
PID 4136 wrote to memory of 3348	4136	Mtn03 Credit Receipt Jpg.exe	92
PID 4136 wrote to memory of 3348	4136	Mtn03 Credit Receipt Jpg.exe	92
PID 4136 wrote to memory of 3348	4136	Mtn03 Credit Receipt Jpg.exe	92
PID 4136 wrote to memory of 3348	4136	Mtn03 Credit Receipt Jpg.exe	92
PID 4136 wrote to memory of 3348	4136	Mtn03 Credit Receipt Jpg.exe	92
PID 4136 wrote to memory of 3348	4136	Mtn03 Credit Receipt Jpg.exe	92
PID 4136 wrote to memory of 3348	4136	Mtn03 Credit Receipt Jpg.exe	92
PID 3348 wrote to memory of 4444	3348	Mtn03 Credit Receipt Jpg.exe	93
PID 3348 wrote to memory of 4444	3348	Mtn03 Credit Receipt Jpg.exe	93
PID 3348 wrote to memory of 4444	3348	Mtn03 Credit Receipt Jpg.exe	93
PID 4444 wrote to memory of 3524	4444	cmd.exe	95
PID 4444 wrote to memory of 3524	4444	cmd.exe	95
PID 4444 wrote to memory of 3524	4444	cmd.exe	95
PID 4444 wrote to memory of 1420	4444	cmd.exe	96
PID 4444 wrote to memory of 1420	4444	cmd.exe	96
PID 4444 wrote to memory of 1420	4444	cmd.exe	96
PID 1420 wrote to memory of 1720	1420	remcos.exe	97
PID 1420 wrote to memory of 1720	1420	remcos.exe	97
PID 1420 wrote to memory of 1720	1420	remcos.exe	97
PID 1420 wrote to memory of 1720	1420	remcos.exe	97
PID 1420 wrote to memory of 1720	1420	remcos.exe	97
PID 1420 wrote to memory of 1720	1420	remcos.exe	97
PID 1420 wrote to memory of 1720	1420	remcos.exe	97
PID 1420 wrote to memory of 1720	1420	remcos.exe	97
PID 1420 wrote to memory of 1720	1420	remcos.exe	97

C:\Users\Admin\AppData\Local\Temp\Mtn03 Credit Receipt Jpg.exe
"C:\Users\Admin\AppData\Local\Temp\Mtn03 Credit Receipt Jpg.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4136
- C:\Users\Admin\AppData\Local\Temp\Mtn03 Credit Receipt Jpg.exe
  "C:\Users\Admin\AppData\Local\Temp\Mtn03 Credit Receipt Jpg.exe"
  2⤵
  - Checks computer location settings
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:3348
- - 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:4444
  - - C:\Windows\SysWOW64\PING.EXE
      PING 127.0.0.1 -n 2
      4⤵
      Runs ping.exe
      PID:3524
  - - C:\Users\Admin\AppData\Roaming\remcos\remcos.exe
      "C:\Users\Admin\AppData\Roaming\remcos\remcos.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      Suspicious use of WriteProcessMemory
      PID:1420
    - - C:\Users\Admin\AppData\Roaming\remcos\remcos.exe
        
        "C:\Users\Admin\AppData\Roaming\remcos\remcos.exe"
        5⤵
        Executes dropped EXE
        Adds Run key to start application
        Suspicious use of FindShellTrayWindow
        Suspicious use of SendNotifyMessage
        Suspicious use of SetWindowsHookEx
        
        PID:1720

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.bat

Filesize
99B

MD5
76c1687d97dfdbcea62ef1490bec5001

SHA1
5f4d1aeafa7d840cde67b76f97416dd68efd1bed

SHA256
79f04ea049979ffd2232c459fdd57fae97a5255aea9b4a2c7dce7ead856f37a4

SHA512
da250f0628632a644f159d818a82a8b9cca8224e46843bddbe0f6f9c32a2d04f7736a620af49ab6d77616317ca7d68285e60043965fe86c03d940835bd30a925

Download Submit
C:\Users\Admin\AppData\Roaming\remcos\remcos.exe

Filesize
519KB

MD5
c39c874e0184d91e2a9ca393c919bac3

SHA1
2ce663a89bf9b7f2dbb8f847585bebd60cee52c7

SHA256
86b29c8b17f5e01fe26349520452e9cf853cfb816ef46f37b071f02b7d96d603

SHA512
8ce86457420fef18bb56c86c8af629752ab652ff45332799e8c4b39e856b209a64f9d9024be21da86f1288767e5dcf4ab41ca8cfc6f6f12f20d2419a92c5a91e

Download Submit
memory/1420-28-0x0000000004E70000-0x0000000004E86000-memory.dmp

Filesize
88KB

Download
memory/1420-27-0x00000000743CE000-0x00000000743CF000-memory.dmp

Filesize
4KB

Download
memory/1720-34-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/1720-33-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/1720-32-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/3348-12-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/3348-15-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/3348-22-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/3348-16-0x0000000000400000-0x0000000000417000-memory.dmp

Filesize
92KB

Download
memory/4136-0-0x00000000743DE000-0x00000000743DF000-memory.dmp

Filesize
4KB

Download
memory/4136-8-0x00000000067D0000-0x00000000067DC000-memory.dmp

Filesize
48KB

Download
memory/4136-11-0x00000000068B0000-0x000000000694C000-memory.dmp

Filesize
624KB

Download
memory/4136-10-0x0000000006A40000-0x0000000006AA0000-memory.dmp

Filesize
384KB

Download
memory/4136-19-0x00000000743D0000-0x0000000074B80000-memory.dmp

Filesize
7.7MB

Download
memory/4136-9-0x00000000067E0000-0x00000000067F0000-memory.dmp

Filesize
64KB

Download
memory/4136-7-0x0000000005B00000-0x0000000005B16000-memory.dmp

Filesize
88KB

Download
memory/4136-6-0x0000000006C30000-0x0000000006CAC000-memory.dmp

Filesize
496KB

Download
memory/4136-5-0x00000000743D0000-0x0000000074B80000-memory.dmp

Filesize
7.7MB

Download
memory/4136-4-0x00000000057C0000-0x00000000057CA000-memory.dmp

Filesize
40KB

Download
memory/4136-3-0x0000000005600000-0x0000000005692000-memory.dmp

Filesize
584KB

Download
memory/4136-2-0x0000000005B10000-0x00000000060B4000-memory.dmp

Filesize
5.6MB

Download
memory/4136-1-0x0000000000B90000-0x0000000000C18000-memory.dmp

Filesize
544KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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