remcos | 4fb5476bfc11cb3da1feffa767cc7abb70040bd0b11c0e26a7e4d2bdc2d5e049

General

Target

XLA.exe
Size

936KB
MD5

c44491911d5cfcc1dc31ac019c2714aa
SHA1

635e1be851baee85fb17cb2781bc6d9ee6a94f8b
SHA256

4fb5476bfc11cb3da1feffa767cc7abb70040bd0b11c0e26a7e4d2bdc2d5e049
SHA512

e4649b1878060833939f6762df5a95275f4b5c4b7108eab2100140a2a5fbd39374d8f9e177a9182423c74d246808e68228f6dd6b6cf109894a255f8ce4505c15
SSDEEP

12288:/44mF6XP6Cau9Jez6Qf2ItKcTvNwjc5ul/1hfeq85A1DisBCos5yrO6okfY+uEjQ:/Ba6fsWlawcWrZYoZfBBj

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

4532 oos.exe
3148 oos.exe

pid	process
4532	oos.exe
3148	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:

XLA.exeWScript.exe

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

oos.exeXLA.exe

description	ioc	process
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\	XLA.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\""	XLA.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	XLA.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	XLA.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

Suspicious use of SetThreadContext 2 IoCs

Processes:

XLA.exeoos.exe

description pid process target process

PID 3800 set thread context of 3528 3800 XLA.exe XLA.exe
PID 4532 set thread context of 3148 4532 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:

XLA.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000_Classes\Local Settings XLA.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

oos.exe

pid process

3148 oos.exe

description	pid	process	target process
PID 3800 set thread context of 3528	3800	XLA.exe	XLA.exe
PID 4532 set thread context of 3148	4532	oos.exe	oos.exe

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

pid	process
3148	oos.exe

Suspicious use of WriteProcessMemory 33 IoCs

Processes:

XLA.exeXLA.exeWScript.execmd.exeoos.exe

description	pid	process	target process
PID 3800 wrote to memory of 3528	3800	XLA.exe	XLA.exe
PID 3800 wrote to memory of 3528	3800	XLA.exe	XLA.exe
PID 3800 wrote to memory of 3528	3800	XLA.exe	XLA.exe
PID 3800 wrote to memory of 3528	3800	XLA.exe	XLA.exe
PID 3800 wrote to memory of 3528	3800	XLA.exe	XLA.exe
PID 3800 wrote to memory of 3528	3800	XLA.exe	XLA.exe
PID 3800 wrote to memory of 3528	3800	XLA.exe	XLA.exe
PID 3800 wrote to memory of 3528	3800	XLA.exe	XLA.exe
PID 3800 wrote to memory of 3528	3800	XLA.exe	XLA.exe
PID 3800 wrote to memory of 3528	3800	XLA.exe	XLA.exe
PID 3800 wrote to memory of 3528	3800	XLA.exe	XLA.exe
PID 3800 wrote to memory of 3528	3800	XLA.exe	XLA.exe
PID 3528 wrote to memory of 2188	3528	XLA.exe	WScript.exe
PID 3528 wrote to memory of 2188	3528	XLA.exe	WScript.exe
PID 3528 wrote to memory of 2188	3528	XLA.exe	WScript.exe
PID 2188 wrote to memory of 4348	2188	WScript.exe	cmd.exe
PID 2188 wrote to memory of 4348	2188	WScript.exe	cmd.exe
PID 2188 wrote to memory of 4348	2188	WScript.exe	cmd.exe
PID 4348 wrote to memory of 4532	4348	cmd.exe	oos.exe
PID 4348 wrote to memory of 4532	4348	cmd.exe	oos.exe
PID 4348 wrote to memory of 4532	4348	cmd.exe	oos.exe
PID 4532 wrote to memory of 3148	4532	oos.exe	oos.exe
PID 4532 wrote to memory of 3148	4532	oos.exe	oos.exe
PID 4532 wrote to memory of 3148	4532	oos.exe	oos.exe
PID 4532 wrote to memory of 3148	4532	oos.exe	oos.exe
PID 4532 wrote to memory of 3148	4532	oos.exe	oos.exe
PID 4532 wrote to memory of 3148	4532	oos.exe	oos.exe
PID 4532 wrote to memory of 3148	4532	oos.exe	oos.exe
PID 4532 wrote to memory of 3148	4532	oos.exe	oos.exe
PID 4532 wrote to memory of 3148	4532	oos.exe	oos.exe
PID 4532 wrote to memory of 3148	4532	oos.exe	oos.exe
PID 4532 wrote to memory of 3148	4532	oos.exe	oos.exe
PID 4532 wrote to memory of 3148	4532	oos.exe	oos.exe

C:\Users\Admin\AppData\Local\Temp\XLA.exe
"C:\Users\Admin\AppData\Local\Temp\XLA.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3800

C:\Users\Admin\AppData\Local\Temp\XLA.exe
"C:\Users\Admin\AppData\Local\Temp\XLA.exe"
2⤵
- Checks computer location settings
- Adds Run key to start application
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3528

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:2188

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\oos.exe"
4⤵
- Suspicious use of WriteProcessMemory
PID:4348

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:4532

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:3148

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
936KB

MD5
c44491911d5cfcc1dc31ac019c2714aa

SHA1
635e1be851baee85fb17cb2781bc6d9ee6a94f8b

SHA256
4fb5476bfc11cb3da1feffa767cc7abb70040bd0b11c0e26a7e4d2bdc2d5e049

SHA512
e4649b1878060833939f6762df5a95275f4b5c4b7108eab2100140a2a5fbd39374d8f9e177a9182423c74d246808e68228f6dd6b6cf109894a255f8ce4505c15

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
936KB

MD5
c44491911d5cfcc1dc31ac019c2714aa

SHA1
635e1be851baee85fb17cb2781bc6d9ee6a94f8b

SHA256
4fb5476bfc11cb3da1feffa767cc7abb70040bd0b11c0e26a7e4d2bdc2d5e049

SHA512
e4649b1878060833939f6762df5a95275f4b5c4b7108eab2100140a2a5fbd39374d8f9e177a9182423c74d246808e68228f6dd6b6cf109894a255f8ce4505c15

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
936KB

MD5
c44491911d5cfcc1dc31ac019c2714aa

SHA1
635e1be851baee85fb17cb2781bc6d9ee6a94f8b

SHA256
4fb5476bfc11cb3da1feffa767cc7abb70040bd0b11c0e26a7e4d2bdc2d5e049

SHA512
e4649b1878060833939f6762df5a95275f4b5c4b7108eab2100140a2a5fbd39374d8f9e177a9182423c74d246808e68228f6dd6b6cf109894a255f8ce4505c15

Download Submit
memory/2188-142-0x0000000000000000-mapping.dmp

Download
memory/3148-149-0x0000000000000000-mapping.dmp

Download
memory/3148-155-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3148-154-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3148-153-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3148-152-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3528-141-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3528-143-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3528-137-0x0000000000000000-mapping.dmp

Download
memory/3528-140-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3528-139-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3528-138-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3800-136-0x0000000008630000-0x00000000086CC000-memory.dmp

Filesize
624KB

Download
memory/3800-135-0x0000000004D50000-0x0000000004D5A000-memory.dmp

Filesize
40KB

Download
memory/3800-134-0x0000000004CB0000-0x0000000004D42000-memory.dmp

Filesize
584KB

Download
memory/3800-132-0x0000000000230000-0x0000000000320000-memory.dmp

Filesize
960KB

Download
memory/3800-133-0x0000000005340000-0x00000000058E4000-memory.dmp

Filesize
5.6MB

Download
memory/4348-145-0x0000000000000000-mapping.dmp

Download
memory/4532-146-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

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Downloads