remcos | 43cb616356d0ad88a91a7beef82159db1e2345df33e0ad8cf4ce80a7cf1c277c

General

Target

b5cb5e1203743569f525e297a5fd1a7b.exe
Size

1.1MB
MD5

b5cb5e1203743569f525e297a5fd1a7b
SHA1

33f65a3b6bb816823866a286848fac808f64c1a0
SHA256

43cb616356d0ad88a91a7beef82159db1e2345df33e0ad8cf4ce80a7cf1c277c
SHA512

b6f5adef6d7c78fa1b3faf6cae0510b994a27a9ad8bdedac553bb15397f99e12b55a3d9299fa8c73884c3c35b7c0e44d1c4e93123d6a3591c87db27817596e4b
SSDEEP

24576:Fj9kqnXJoyWyjv5IsSpW4X8riQIVLiT2Ea+ylAROJ3+PpLnSlF:FCMXJoZ85h8X8GQQLM2LfSW34nkF

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 1 IoCs

Processes:

oos.exe

pid process

1688 oos.exe
Loads dropped DLL 2 IoCs

Processes:

cmd.exe

pid process

688 cmd.exe
688 cmd.exe

pid	process
1688	oos.exe

pid	process
688	cmd.exe
688	cmd.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

b5cb5e1203743569f525e297a5fd1a7b.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	b5cb5e1203743569f525e297a5fd1a7b.exe
Key created	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\	b5cb5e1203743569f525e297a5fd1a7b.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\kkl = "\"C:\\Users\\Admin\\AppData\\Roaming\\oos.exe\""	b5cb5e1203743569f525e297a5fd1a7b.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\	b5cb5e1203743569f525e297a5fd1a7b.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

b5cb5e1203743569f525e297a5fd1a7b.exe

description pid process target process

PID 748 set thread context of 1396 748 b5cb5e1203743569f525e297a5fd1a7b.exe b5cb5e1203743569f525e297a5fd1a7b.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

description	pid	process	target process
PID 748 set thread context of 1396	748	b5cb5e1203743569f525e297a5fd1a7b.exe	b5cb5e1203743569f525e297a5fd1a7b.exe

Suspicious use of WriteProcessMemory 25 IoCs

Processes:

b5cb5e1203743569f525e297a5fd1a7b.exeb5cb5e1203743569f525e297a5fd1a7b.exeWScript.execmd.exe

description	pid	process	target process
PID 748 wrote to memory of 1396	748	b5cb5e1203743569f525e297a5fd1a7b.exe	b5cb5e1203743569f525e297a5fd1a7b.exe
PID 748 wrote to memory of 1396	748	b5cb5e1203743569f525e297a5fd1a7b.exe	b5cb5e1203743569f525e297a5fd1a7b.exe
PID 748 wrote to memory of 1396	748	b5cb5e1203743569f525e297a5fd1a7b.exe	b5cb5e1203743569f525e297a5fd1a7b.exe
PID 748 wrote to memory of 1396	748	b5cb5e1203743569f525e297a5fd1a7b.exe	b5cb5e1203743569f525e297a5fd1a7b.exe
PID 748 wrote to memory of 1396	748	b5cb5e1203743569f525e297a5fd1a7b.exe	b5cb5e1203743569f525e297a5fd1a7b.exe
PID 748 wrote to memory of 1396	748	b5cb5e1203743569f525e297a5fd1a7b.exe	b5cb5e1203743569f525e297a5fd1a7b.exe
PID 748 wrote to memory of 1396	748	b5cb5e1203743569f525e297a5fd1a7b.exe	b5cb5e1203743569f525e297a5fd1a7b.exe
PID 748 wrote to memory of 1396	748	b5cb5e1203743569f525e297a5fd1a7b.exe	b5cb5e1203743569f525e297a5fd1a7b.exe
PID 748 wrote to memory of 1396	748	b5cb5e1203743569f525e297a5fd1a7b.exe	b5cb5e1203743569f525e297a5fd1a7b.exe
PID 748 wrote to memory of 1396	748	b5cb5e1203743569f525e297a5fd1a7b.exe	b5cb5e1203743569f525e297a5fd1a7b.exe
PID 748 wrote to memory of 1396	748	b5cb5e1203743569f525e297a5fd1a7b.exe	b5cb5e1203743569f525e297a5fd1a7b.exe
PID 748 wrote to memory of 1396	748	b5cb5e1203743569f525e297a5fd1a7b.exe	b5cb5e1203743569f525e297a5fd1a7b.exe
PID 748 wrote to memory of 1396	748	b5cb5e1203743569f525e297a5fd1a7b.exe	b5cb5e1203743569f525e297a5fd1a7b.exe
PID 1396 wrote to memory of 1220	1396	b5cb5e1203743569f525e297a5fd1a7b.exe	WScript.exe
PID 1396 wrote to memory of 1220	1396	b5cb5e1203743569f525e297a5fd1a7b.exe	WScript.exe
PID 1396 wrote to memory of 1220	1396	b5cb5e1203743569f525e297a5fd1a7b.exe	WScript.exe
PID 1396 wrote to memory of 1220	1396	b5cb5e1203743569f525e297a5fd1a7b.exe	WScript.exe
PID 1220 wrote to memory of 688	1220	WScript.exe	cmd.exe
PID 1220 wrote to memory of 688	1220	WScript.exe	cmd.exe
PID 1220 wrote to memory of 688	1220	WScript.exe	cmd.exe
PID 1220 wrote to memory of 688	1220	WScript.exe	cmd.exe
PID 688 wrote to memory of 1688	688	cmd.exe	oos.exe
PID 688 wrote to memory of 1688	688	cmd.exe	oos.exe
PID 688 wrote to memory of 1688	688	cmd.exe	oos.exe
PID 688 wrote to memory of 1688	688	cmd.exe	oos.exe

C:\Users\Admin\AppData\Local\Temp\b5cb5e1203743569f525e297a5fd1a7b.exe
"C:\Users\Admin\AppData\Local\Temp\b5cb5e1203743569f525e297a5fd1a7b.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:748

C:\Users\Admin\AppData\Local\Temp\b5cb5e1203743569f525e297a5fd1a7b.exe
"C:\Users\Admin\AppData\Local\Temp\b5cb5e1203743569f525e297a5fd1a7b.exe"
2⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1396

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
3⤵
- Suspicious use of WriteProcessMemory
PID:1220

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:688

C:\Users\Admin\AppData\Roaming\oos.exe
C:\Users\Admin\AppData\Roaming\oos.exe
5⤵
- Executes dropped EXE
PID:1688

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

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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
b5cb5e1203743569f525e297a5fd1a7b

SHA1
33f65a3b6bb816823866a286848fac808f64c1a0

SHA256
43cb616356d0ad88a91a7beef82159db1e2345df33e0ad8cf4ce80a7cf1c277c

SHA512
b6f5adef6d7c78fa1b3faf6cae0510b994a27a9ad8bdedac553bb15397f99e12b55a3d9299fa8c73884c3c35b7c0e44d1c4e93123d6a3591c87db27817596e4b

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

MD5
b5cb5e1203743569f525e297a5fd1a7b

SHA1
33f65a3b6bb816823866a286848fac808f64c1a0

SHA256
43cb616356d0ad88a91a7beef82159db1e2345df33e0ad8cf4ce80a7cf1c277c

SHA512
b6f5adef6d7c78fa1b3faf6cae0510b994a27a9ad8bdedac553bb15397f99e12b55a3d9299fa8c73884c3c35b7c0e44d1c4e93123d6a3591c87db27817596e4b

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

MD5
b5cb5e1203743569f525e297a5fd1a7b

SHA1
33f65a3b6bb816823866a286848fac808f64c1a0

SHA256
43cb616356d0ad88a91a7beef82159db1e2345df33e0ad8cf4ce80a7cf1c277c

SHA512
b6f5adef6d7c78fa1b3faf6cae0510b994a27a9ad8bdedac553bb15397f99e12b55a3d9299fa8c73884c3c35b7c0e44d1c4e93123d6a3591c87db27817596e4b

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

MD5
b5cb5e1203743569f525e297a5fd1a7b

SHA1
33f65a3b6bb816823866a286848fac808f64c1a0

SHA256
43cb616356d0ad88a91a7beef82159db1e2345df33e0ad8cf4ce80a7cf1c277c

SHA512
b6f5adef6d7c78fa1b3faf6cae0510b994a27a9ad8bdedac553bb15397f99e12b55a3d9299fa8c73884c3c35b7c0e44d1c4e93123d6a3591c87db27817596e4b

Download Submit
memory/688-81-0x0000000000000000-mapping.dmp

Download
memory/748-54-0x0000000000290000-0x00000000003A6000-memory.dmp

Filesize
1.1MB

Download
memory/748-55-0x0000000075B11000-0x0000000075B13000-memory.dmp

Filesize
8KB

Download
memory/748-56-0x0000000000650000-0x0000000000666000-memory.dmp

Filesize
88KB

Download
memory/748-57-0x0000000005BE0000-0x0000000005CB0000-memory.dmp

Filesize
832KB

Download
memory/748-58-0x0000000005CB0000-0x0000000005D2A000-memory.dmp

Filesize
488KB

Download
memory/1220-77-0x0000000000000000-mapping.dmp

Download
memory/1396-69-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1396-66-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1396-72-0x000000000043168C-mapping.dmp

Download
memory/1396-75-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1396-76-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1396-67-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1396-78-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1396-71-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1396-65-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1396-64-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1396-59-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1396-62-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1396-60-0x0000000000400000-0x000000000047E000-memory.dmp

Filesize
504KB

Download
memory/1688-85-0x0000000000000000-mapping.dmp

Download
memory/1688-87-0x0000000000130000-0x0000000000246000-memory.dmp

Filesize
1.1MB

Download

Analysis

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