remcos | be9fe1cd741c239b0ce1b3edc3fb8f87445acf71ab2fb5346197e50c2da66968

General

Target

tmp.exe
Size

1.1MB
MD5

b4b5917ae4c8231d912bd02bfccfe11a
SHA1

c8d19594e9800f9a5a0c8126ce2514d6f8f9d45b
SHA256

be9fe1cd741c239b0ce1b3edc3fb8f87445acf71ab2fb5346197e50c2da66968
SHA512

c6928b42412d84d686e47dcd7915f2f165dd81284cdd1b0b55d309b8552d6e1a867fb1838fbd44c47881fca7b9b371e723dcbffb39c14f02e3748968a1d8ae8f
SSDEEP

24576:sQkTuE0RAaMZqeaZWFJQEgwSdqZC62+cN2qd9H+fPpLnSlF:sBEeXqeaZWFJQtdqEF9HsnkF

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

1296 oos.exe
3340 oos.exe

pid	process
1296	oos.exe
3340	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:

tmp.exeWScript.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	tmp.exe
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\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:

tmp.exeoos.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	tmp.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	tmp.exe
Key created	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Software\Microsoft\Windows\CurrentVersion\Run\	oos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\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-1-5-21-929662420-1054238289-2961194603-1000\Software\Microsoft\Windows\CurrentVersion\Run\	tmp.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	tmp.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

tmp.exeoos.exe

description pid process target process

PID 4224 set thread context of 1664 4224 tmp.exe tmp.exe
PID 1296 set thread context of 3340 1296 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:

tmp.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000_Classes\Local Settings tmp.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

tmp.exe

pid process

4224 tmp.exe
4224 tmp.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

tmp.exe

description pid process

Token: SeDebugPrivilege 4224 tmp.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

oos.exe

pid process

3340 oos.exe

description	pid	process	target process
PID 4224 set thread context of 1664	4224	tmp.exe	tmp.exe
PID 1296 set thread context of 3340	1296	oos.exe	oos.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000_Classes\Local Settings	tmp.exe

pid	process
4224	tmp.exe
4224	tmp.exe

description	pid	process
Token: SeDebugPrivilege	4224	tmp.exe

pid	process
3340	oos.exe

Suspicious use of WriteProcessMemory 36 IoCs

Processes:

tmp.exetmp.exeWScript.execmd.exeoos.exe

description	pid	process	target process
PID 4224 wrote to memory of 4744	4224	tmp.exe	tmp.exe
PID 4224 wrote to memory of 4744	4224	tmp.exe	tmp.exe
PID 4224 wrote to memory of 4744	4224	tmp.exe	tmp.exe
PID 4224 wrote to memory of 1664	4224	tmp.exe	tmp.exe
PID 4224 wrote to memory of 1664	4224	tmp.exe	tmp.exe
PID 4224 wrote to memory of 1664	4224	tmp.exe	tmp.exe
PID 4224 wrote to memory of 1664	4224	tmp.exe	tmp.exe
PID 4224 wrote to memory of 1664	4224	tmp.exe	tmp.exe
PID 4224 wrote to memory of 1664	4224	tmp.exe	tmp.exe
PID 4224 wrote to memory of 1664	4224	tmp.exe	tmp.exe
PID 4224 wrote to memory of 1664	4224	tmp.exe	tmp.exe
PID 4224 wrote to memory of 1664	4224	tmp.exe	tmp.exe
PID 4224 wrote to memory of 1664	4224	tmp.exe	tmp.exe
PID 4224 wrote to memory of 1664	4224	tmp.exe	tmp.exe
PID 4224 wrote to memory of 1664	4224	tmp.exe	tmp.exe
PID 1664 wrote to memory of 4756	1664	tmp.exe	WScript.exe
PID 1664 wrote to memory of 4756	1664	tmp.exe	WScript.exe
PID 1664 wrote to memory of 4756	1664	tmp.exe	WScript.exe
PID 4756 wrote to memory of 1632	4756	WScript.exe	cmd.exe
PID 4756 wrote to memory of 1632	4756	WScript.exe	cmd.exe
PID 4756 wrote to memory of 1632	4756	WScript.exe	cmd.exe
PID 1632 wrote to memory of 1296	1632	cmd.exe	oos.exe
PID 1632 wrote to memory of 1296	1632	cmd.exe	oos.exe
PID 1632 wrote to memory of 1296	1632	cmd.exe	oos.exe
PID 1296 wrote to memory of 3340	1296	oos.exe	oos.exe
PID 1296 wrote to memory of 3340	1296	oos.exe	oos.exe
PID 1296 wrote to memory of 3340	1296	oos.exe	oos.exe
PID 1296 wrote to memory of 3340	1296	oos.exe	oos.exe
PID 1296 wrote to memory of 3340	1296	oos.exe	oos.exe
PID 1296 wrote to memory of 3340	1296	oos.exe	oos.exe
PID 1296 wrote to memory of 3340	1296	oos.exe	oos.exe
PID 1296 wrote to memory of 3340	1296	oos.exe	oos.exe
PID 1296 wrote to memory of 3340	1296	oos.exe	oos.exe
PID 1296 wrote to memory of 3340	1296	oos.exe	oos.exe
PID 1296 wrote to memory of 3340	1296	oos.exe	oos.exe
PID 1296 wrote to memory of 3340	1296	oos.exe	oos.exe

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4224

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
2⤵
PID:4744

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
2⤵
- Checks computer location settings
- Adds Run key to start application
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1664

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:4756

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\oos.exe"
4⤵
- Suspicious use of WriteProcessMemory
PID:1632

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:1296

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:3340

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
1.1MB

MD5
b4b5917ae4c8231d912bd02bfccfe11a

SHA1
c8d19594e9800f9a5a0c8126ce2514d6f8f9d45b

SHA256
be9fe1cd741c239b0ce1b3edc3fb8f87445acf71ab2fb5346197e50c2da66968

SHA512
c6928b42412d84d686e47dcd7915f2f165dd81284cdd1b0b55d309b8552d6e1a867fb1838fbd44c47881fca7b9b371e723dcbffb39c14f02e3748968a1d8ae8f

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
1.1MB

MD5
b4b5917ae4c8231d912bd02bfccfe11a

SHA1
c8d19594e9800f9a5a0c8126ce2514d6f8f9d45b

SHA256
be9fe1cd741c239b0ce1b3edc3fb8f87445acf71ab2fb5346197e50c2da66968

SHA512
c6928b42412d84d686e47dcd7915f2f165dd81284cdd1b0b55d309b8552d6e1a867fb1838fbd44c47881fca7b9b371e723dcbffb39c14f02e3748968a1d8ae8f

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
1.1MB

MD5
b4b5917ae4c8231d912bd02bfccfe11a

SHA1
c8d19594e9800f9a5a0c8126ce2514d6f8f9d45b

SHA256
be9fe1cd741c239b0ce1b3edc3fb8f87445acf71ab2fb5346197e50c2da66968

SHA512
c6928b42412d84d686e47dcd7915f2f165dd81284cdd1b0b55d309b8552d6e1a867fb1838fbd44c47881fca7b9b371e723dcbffb39c14f02e3748968a1d8ae8f

Download Submit
memory/1296-148-0x0000000000000000-mapping.dmp

Download
memory/1632-147-0x0000000000000000-mapping.dmp

Download
memory/1664-139-0x0000000000000000-mapping.dmp

Download
memory/1664-140-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1664-141-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1664-145-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1664-143-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1664-142-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3340-151-0x0000000000000000-mapping.dmp

Download
memory/3340-155-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3340-157-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3340-154-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/3340-156-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/4224-136-0x0000000008EA0000-0x0000000008F3C000-memory.dmp

Filesize
624KB

Download
memory/4224-133-0x0000000005BD0000-0x0000000006174000-memory.dmp

Filesize
5.6MB

Download
memory/4224-134-0x0000000005620000-0x00000000056B2000-memory.dmp

Filesize
584KB

Download
memory/4224-135-0x00000000055B0000-0x00000000055BA000-memory.dmp

Filesize
40KB

Download
memory/4224-132-0x0000000000B00000-0x0000000000C14000-memory.dmp

Filesize
1.1MB

Download
memory/4224-137-0x0000000009210000-0x0000000009276000-memory.dmp

Filesize
408KB

Download
memory/4744-138-0x0000000000000000-mapping.dmp

Download
memory/4756-144-0x0000000000000000-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