remcos | 99d28200203baac82a7253419526711f38d7ecb1a6098f243c8656adc72ef6d8

General

Target

JEF.exe
Size

934KB
MD5

9bd821ba65b89710d2d81c7a7b98ab5d
SHA1

cbdc6446729b60601f7c288bc063cd9cc216f925
SHA256

99d28200203baac82a7253419526711f38d7ecb1a6098f243c8656adc72ef6d8
SHA512

30ad861b9015a201cec5e6a88ce6cba3e03459f1c709ef50c89505de96e5760e7c1647dc8382751fffc3c9ed843b539114b52051e8d564c6fde7fad08436c5a4
SSDEEP

24576:xcCEmyVj6jI43L84UytM00todtTQxRjU/oe:xcCRI6jIepUy+ZtmdGR

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

1784 oos.exe
608 oos.exe
Loads dropped DLL 2 IoCs

Processes:

cmd.exe

pid process

1760 cmd.exe
1760 cmd.exe

pid	process
1784	oos.exe
608	oos.exe

pid	process
1760	cmd.exe
1760	cmd.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

JEF.exeoos.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	JEF.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\	JEF.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	JEF.exe
Key created	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\	oos.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\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-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\	JEF.exe

Suspicious use of SetThreadContext 2 IoCs

Processes:

JEF.exeoos.exe

description pid process target process

PID 1600 set thread context of 680 1600 JEF.exe JEF.exe
PID 1784 set thread context of 608 1784 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
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

oos.exe

pid process

608 oos.exe

description	pid	process	target process
PID 1600 set thread context of 680	1600	JEF.exe	JEF.exe
PID 1784 set thread context of 608	1784	oos.exe	oos.exe

pid	process
608	oos.exe

Suspicious use of WriteProcessMemory 38 IoCs

Processes:

JEF.exeJEF.exeWScript.execmd.exeoos.exe

description	pid	process	target process
PID 1600 wrote to memory of 680	1600	JEF.exe	JEF.exe
PID 1600 wrote to memory of 680	1600	JEF.exe	JEF.exe
PID 1600 wrote to memory of 680	1600	JEF.exe	JEF.exe
PID 1600 wrote to memory of 680	1600	JEF.exe	JEF.exe
PID 1600 wrote to memory of 680	1600	JEF.exe	JEF.exe
PID 1600 wrote to memory of 680	1600	JEF.exe	JEF.exe
PID 1600 wrote to memory of 680	1600	JEF.exe	JEF.exe
PID 1600 wrote to memory of 680	1600	JEF.exe	JEF.exe
PID 1600 wrote to memory of 680	1600	JEF.exe	JEF.exe
PID 1600 wrote to memory of 680	1600	JEF.exe	JEF.exe
PID 1600 wrote to memory of 680	1600	JEF.exe	JEF.exe
PID 1600 wrote to memory of 680	1600	JEF.exe	JEF.exe
PID 1600 wrote to memory of 680	1600	JEF.exe	JEF.exe
PID 680 wrote to memory of 1552	680	JEF.exe	WScript.exe
PID 680 wrote to memory of 1552	680	JEF.exe	WScript.exe
PID 680 wrote to memory of 1552	680	JEF.exe	WScript.exe
PID 680 wrote to memory of 1552	680	JEF.exe	WScript.exe
PID 1552 wrote to memory of 1760	1552	WScript.exe	cmd.exe
PID 1552 wrote to memory of 1760	1552	WScript.exe	cmd.exe
PID 1552 wrote to memory of 1760	1552	WScript.exe	cmd.exe
PID 1552 wrote to memory of 1760	1552	WScript.exe	cmd.exe
PID 1760 wrote to memory of 1784	1760	cmd.exe	oos.exe
PID 1760 wrote to memory of 1784	1760	cmd.exe	oos.exe
PID 1760 wrote to memory of 1784	1760	cmd.exe	oos.exe
PID 1760 wrote to memory of 1784	1760	cmd.exe	oos.exe
PID 1784 wrote to memory of 608	1784	oos.exe	oos.exe
PID 1784 wrote to memory of 608	1784	oos.exe	oos.exe
PID 1784 wrote to memory of 608	1784	oos.exe	oos.exe
PID 1784 wrote to memory of 608	1784	oos.exe	oos.exe
PID 1784 wrote to memory of 608	1784	oos.exe	oos.exe
PID 1784 wrote to memory of 608	1784	oos.exe	oos.exe
PID 1784 wrote to memory of 608	1784	oos.exe	oos.exe
PID 1784 wrote to memory of 608	1784	oos.exe	oos.exe
PID 1784 wrote to memory of 608	1784	oos.exe	oos.exe
PID 1784 wrote to memory of 608	1784	oos.exe	oos.exe
PID 1784 wrote to memory of 608	1784	oos.exe	oos.exe
PID 1784 wrote to memory of 608	1784	oos.exe	oos.exe
PID 1784 wrote to memory of 608	1784	oos.exe	oos.exe

C:\Users\Admin\AppData\Local\Temp\JEF.exe
"C:\Users\Admin\AppData\Local\Temp\JEF.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1600

C:\Users\Admin\AppData\Local\Temp\JEF.exe
"C:\Users\Admin\AppData\Local\Temp\JEF.exe"
2⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:680

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
3⤵
- Suspicious use of WriteProcessMemory
PID:1552

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\oos.exe"
4⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1760

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:1784

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:608

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

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

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
934KB

MD5
9bd821ba65b89710d2d81c7a7b98ab5d

SHA1
cbdc6446729b60601f7c288bc063cd9cc216f925

SHA256
99d28200203baac82a7253419526711f38d7ecb1a6098f243c8656adc72ef6d8

SHA512
30ad861b9015a201cec5e6a88ce6cba3e03459f1c709ef50c89505de96e5760e7c1647dc8382751fffc3c9ed843b539114b52051e8d564c6fde7fad08436c5a4

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
934KB

MD5
9bd821ba65b89710d2d81c7a7b98ab5d

SHA1
cbdc6446729b60601f7c288bc063cd9cc216f925

SHA256
99d28200203baac82a7253419526711f38d7ecb1a6098f243c8656adc72ef6d8

SHA512
30ad861b9015a201cec5e6a88ce6cba3e03459f1c709ef50c89505de96e5760e7c1647dc8382751fffc3c9ed843b539114b52051e8d564c6fde7fad08436c5a4

Download Submit
C:\Users\Admin\AppData\Roaming\oos.exe
Filesize
934KB

MD5
9bd821ba65b89710d2d81c7a7b98ab5d

SHA1
cbdc6446729b60601f7c288bc063cd9cc216f925

SHA256
99d28200203baac82a7253419526711f38d7ecb1a6098f243c8656adc72ef6d8

SHA512
30ad861b9015a201cec5e6a88ce6cba3e03459f1c709ef50c89505de96e5760e7c1647dc8382751fffc3c9ed843b539114b52051e8d564c6fde7fad08436c5a4

Download Submit
\Users\Admin\AppData\Roaming\oos.exe
Filesize
934KB

MD5
9bd821ba65b89710d2d81c7a7b98ab5d

SHA1
cbdc6446729b60601f7c288bc063cd9cc216f925

SHA256
99d28200203baac82a7253419526711f38d7ecb1a6098f243c8656adc72ef6d8

SHA512
30ad861b9015a201cec5e6a88ce6cba3e03459f1c709ef50c89505de96e5760e7c1647dc8382751fffc3c9ed843b539114b52051e8d564c6fde7fad08436c5a4

Download Submit
\Users\Admin\AppData\Roaming\oos.exe
Filesize
934KB

MD5
9bd821ba65b89710d2d81c7a7b98ab5d

SHA1
cbdc6446729b60601f7c288bc063cd9cc216f925

SHA256
99d28200203baac82a7253419526711f38d7ecb1a6098f243c8656adc72ef6d8

SHA512
30ad861b9015a201cec5e6a88ce6cba3e03459f1c709ef50c89505de96e5760e7c1647dc8382751fffc3c9ed843b539114b52051e8d564c6fde7fad08436c5a4

Download Submit
memory/608-108-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/608-107-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/608-106-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/608-102-0x000000000043168C-mapping.dmp

Download
memory/680-76-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/680-61-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/680-68-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/680-70-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/680-73-0x000000000043168C-mapping.dmp

Download
memory/680-72-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/680-67-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/680-78-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/680-66-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/680-60-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/680-65-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/680-63-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1552-77-0x0000000000000000-mapping.dmp

Download
memory/1600-54-0x0000000001120000-0x0000000001210000-memory.dmp

Filesize
960KB

Download
memory/1600-59-0x0000000005010000-0x000000000508A000-memory.dmp

Filesize
488KB

Download
memory/1600-58-0x0000000007F10000-0x0000000007FC0000-memory.dmp

Filesize
704KB

Download
memory/1600-57-0x0000000000B70000-0x0000000000B86000-memory.dmp

Filesize
88KB

Download
memory/1600-56-0x00000000051B0000-0x0000000005294000-memory.dmp

Filesize
912KB

Download
memory/1600-55-0x0000000076461000-0x0000000076463000-memory.dmp

Filesize
8KB

Download
memory/1760-81-0x0000000000000000-mapping.dmp

Download
memory/1784-85-0x0000000000000000-mapping.dmp

Download
memory/1784-87-0x0000000000F20000-0x0000000001010000-memory.dmp

Filesize
960KB

Download

Analysis

Sharing