remcos | bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d

General

Target

bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
Size

935KB
MD5

24a3d9e65e52ca7808b8b54f4fd49293
SHA1

ba8ba4083f5f9e2f638f972c077c7358dd4db546
SHA256

bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d
SHA512

9d88d1455ad1760a60fca2951209bfed16ee9b7b171d7a7e1f7460325aa16b32dfbd0a3e3c943b77d5820ce52e769672d7bb4109e01687064428e330e670cd2d
SSDEEP

24576:3X1fONoAqzW2tYD6yzNyMZq08dHr17VsYu8v8G68Eg:n1mNoRzyD6oyjHrtXu3X8E

Score

10^/10

remcos xp persistence rat

Malware Config

Extracted

Family

remcos

Botnet

XP

C2

xpremcuz300622.ddns.net:3542

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
oos.exe
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
mouse_option
false
mutex
Remcos-MMP2I7
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
kkl
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Executes dropped EXE 2 IoCs

Processes:

oos.exeoos.exe

pid process

1440 oos.exe
2364 oos.exe

pid	process
1440	oos.exe
2364	oos.exe

Checks computer location settings 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exeWScript.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	WScript.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exeoos.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
Key created	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Windows\CurrentVersion\Run\	oos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	oos.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	oos.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	oos.exe
Key created	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Software\Microsoft\Windows\CurrentVersion\Run\	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exeoos.exe

description	pid	process	target process
PID 4348 set thread context of 3804	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 1440 set thread context of 2364	1440	oos.exe	oos.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

Processes:

bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000_Classes\Local Settings	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe

pid	process
4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe

description pid process

Token: SeDebugPrivilege 4348 bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

oos.exe

pid process

2364 oos.exe

description	pid	process
Token: SeDebugPrivilege	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe

pid	process
2364	oos.exe

Suspicious use of WriteProcessMemory 36 IoCs

Processes:

bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exebf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exeWScript.execmd.exeoos.exe

description	pid	process	target process
PID 4348 wrote to memory of 3064	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 4348 wrote to memory of 3064	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 4348 wrote to memory of 3064	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 4348 wrote to memory of 3804	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 4348 wrote to memory of 3804	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 4348 wrote to memory of 3804	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 4348 wrote to memory of 3804	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 4348 wrote to memory of 3804	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 4348 wrote to memory of 3804	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 4348 wrote to memory of 3804	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 4348 wrote to memory of 3804	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 4348 wrote to memory of 3804	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 4348 wrote to memory of 3804	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 4348 wrote to memory of 3804	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 4348 wrote to memory of 3804	4348	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
PID 3804 wrote to memory of 4256	3804	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	WScript.exe
PID 3804 wrote to memory of 4256	3804	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	WScript.exe
PID 3804 wrote to memory of 4256	3804	bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe	WScript.exe
PID 4256 wrote to memory of 2276	4256	WScript.exe	cmd.exe
PID 4256 wrote to memory of 2276	4256	WScript.exe	cmd.exe
PID 4256 wrote to memory of 2276	4256	WScript.exe	cmd.exe
PID 2276 wrote to memory of 1440	2276	cmd.exe	oos.exe
PID 2276 wrote to memory of 1440	2276	cmd.exe	oos.exe
PID 2276 wrote to memory of 1440	2276	cmd.exe	oos.exe
PID 1440 wrote to memory of 2364	1440	oos.exe	oos.exe
PID 1440 wrote to memory of 2364	1440	oos.exe	oos.exe
PID 1440 wrote to memory of 2364	1440	oos.exe	oos.exe
PID 1440 wrote to memory of 2364	1440	oos.exe	oos.exe
PID 1440 wrote to memory of 2364	1440	oos.exe	oos.exe
PID 1440 wrote to memory of 2364	1440	oos.exe	oos.exe
PID 1440 wrote to memory of 2364	1440	oos.exe	oos.exe
PID 1440 wrote to memory of 2364	1440	oos.exe	oos.exe
PID 1440 wrote to memory of 2364	1440	oos.exe	oos.exe
PID 1440 wrote to memory of 2364	1440	oos.exe	oos.exe
PID 1440 wrote to memory of 2364	1440	oos.exe	oos.exe
PID 1440 wrote to memory of 2364	1440	oos.exe	oos.exe

C:\Users\Admin\AppData\Local\Temp\bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
"C:\Users\Admin\AppData\Local\Temp\bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4348

C:\Users\Admin\AppData\Local\Temp\bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
"C:\Users\Admin\AppData\Local\Temp\bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe"
2⤵
PID:3064

C:\Users\Admin\AppData\Local\Temp\bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe
"C:\Users\Admin\AppData\Local\Temp\bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d.exe"
2⤵
- Checks computer location settings
- Adds Run key to start application
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3804

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
3⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4256

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\oos.exe"
4⤵
- Suspicious use of WriteProcessMemory
PID:2276

C:\Users\Admin\AppData\Roaming\oos.exe
C:\Users\Admin\AppData\Roaming\oos.exe
5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1440

C:\Users\Admin\AppData\Roaming\oos.exe
"C:\Users\Admin\AppData\Roaming\oos.exe"
6⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetWindowsHookEx
PID:2364

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.vbs
Filesize
398B

MD5
a5d3440f90cbfae712166e20870eaed7

SHA1
cc1e1a2945eb2ad475234344f7527ad9e9873647

SHA256
960a570da95b8d16809cbcc18e8ca4d81e16cb666354ddc1d572daf93f291f02

SHA512
d3136a280fbb326ccc5cb5ab1214aed8ccd6baa7f3f89ef9e0b5bf391a957dab2c121640bb056e6cbda0594f83133c4dbb4e1e2f0e290b44a401cd2cf8cfd4aa

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
935KB

MD5
24a3d9e65e52ca7808b8b54f4fd49293

SHA1
ba8ba4083f5f9e2f638f972c077c7358dd4db546

SHA256
bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d

SHA512
9d88d1455ad1760a60fca2951209bfed16ee9b7b171d7a7e1f7460325aa16b32dfbd0a3e3c943b77d5820ce52e769672d7bb4109e01687064428e330e670cd2d

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
935KB

MD5
24a3d9e65e52ca7808b8b54f4fd49293

SHA1
ba8ba4083f5f9e2f638f972c077c7358dd4db546

SHA256
bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d

SHA512
9d88d1455ad1760a60fca2951209bfed16ee9b7b171d7a7e1f7460325aa16b32dfbd0a3e3c943b77d5820ce52e769672d7bb4109e01687064428e330e670cd2d

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
935KB

MD5
24a3d9e65e52ca7808b8b54f4fd49293

SHA1
ba8ba4083f5f9e2f638f972c077c7358dd4db546

SHA256
bf5a377899f6233ee48281997d6c23ae42f78319f6368e946ffa78de01fa307d

SHA512
9d88d1455ad1760a60fca2951209bfed16ee9b7b171d7a7e1f7460325aa16b32dfbd0a3e3c943b77d5820ce52e769672d7bb4109e01687064428e330e670cd2d

Download Submit
memory/1440-147-0x0000000000000000-mapping.dmp

Download
memory/2276-146-0x0000000000000000-mapping.dmp

Download
memory/2364-156-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/2364-155-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/2364-154-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/2364-153-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/2364-150-0x0000000000000000-mapping.dmp

Download
memory/3064-137-0x0000000000000000-mapping.dmp

Download
memory/3804-138-0x0000000000000000-mapping.dmp

Download
memory/3804-144-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3804-142-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3804-141-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3804-140-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3804-139-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/4256-143-0x0000000000000000-mapping.dmp

Download
memory/4348-132-0x0000000000080000-0x0000000000170000-memory.dmp

Filesize
960KB

Download
memory/4348-136-0x00000000087A0000-0x000000000883C000-memory.dmp

Filesize
624KB

Download
memory/4348-135-0x0000000004B00000-0x0000000004B0A000-memory.dmp

Filesize
40KB

Download
memory/4348-134-0x0000000004B30000-0x0000000004BC2000-memory.dmp

Filesize
584KB

Download
memory/4348-133-0x0000000005000000-0x00000000055A4000-memory.dmp

Filesize
5.6MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads