remcos | 39475882127fd9789d9c23444153a4a4841f3ffbb34ffabb0c540e6e9d76d034

General

Target

39475882127fd9789d9c23444153a4a4841f3ffbb34ffabb0c540e6e9d76d034.exe
Size

1.3MB
MD5

913c99449a29c2640d36b0d5fdf69289
SHA1

858971f52ab45dc8be5f2c43da9b0c25ba398435
SHA256

39475882127fd9789d9c23444153a4a4841f3ffbb34ffabb0c540e6e9d76d034
SHA512

b35a9a28d01a948455da4d078d9f9d1aacb5e9fff5c8359b4278400e29296c75ff96554ae6cc8cd4f53d1db8525d43927c87b793e3fb2e72549d944fd62a6d96
SSDEEP

24576:AP+g7Wy3xfMZKdcKtTjbJ4HEEEEEEEEEEEEEEEEEEEETKKKKKKKKKKKKKKKKKKK7:A/iy3g6TjbsEEEEEEEEEEEEEEEEEEEE+

Score

10^/10

remcos remotehost persistence rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

wwsaer.duckdns.org:8533

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
notes
mouse_option
false
mutex
Rmc-9VASLD
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

Detects Windows exceutables bypassing UAC using CMSTP COM interfaces. MITRE (T1218.003) 14 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3732-7-0x0000000033890000-0x0000000034890000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
behavioral2/memory/3732-10-0x0000000033890000-0x0000000034890000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
behavioral2/memory/3732-11-0x0000000033890000-0x0000000034890000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
behavioral2/memory/3732-18-0x0000000033890000-0x0000000034890000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
behavioral2/memory/3732-20-0x0000000033890000-0x0000000034890000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
behavioral2/memory/3732-27-0x0000000033890000-0x0000000034890000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
behavioral2/memory/3732-28-0x0000000033890000-0x0000000034890000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
behavioral2/memory/3732-35-0x0000000033890000-0x0000000034890000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
behavioral2/memory/3732-37-0x0000000033890000-0x0000000034890000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
behavioral2/memory/3732-45-0x0000000033890000-0x0000000034890000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
behavioral2/memory/3732-46-0x0000000033890000-0x0000000034890000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
behavioral2/memory/3732-53-0x0000000033890000-0x0000000034890000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
behavioral2/memory/3732-54-0x0000000033890000-0x0000000034890000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
behavioral2/memory/3732-61-0x0000000033890000-0x0000000034890000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

39475882127fd9789d9c23444153a4a4841f3ffbb34ffabb0c540e6e9d76d034.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Efftwcmk = "C:\\Users\\Public\\Efftwcmk.url"	39475882127fd9789d9c23444153a4a4841f3ffbb34ffabb0c540e6e9d76d034.exe

Script User-Agent 2 IoCs

Uses user-agent string associated with script host/environment.

Processes:

description	flow	ioc
HTTP User-Agent header	30	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	33	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

39475882127fd9789d9c23444153a4a4841f3ffbb34ffabb0c540e6e9d76d034.exe

pid process

3732 39475882127fd9789d9c23444153a4a4841f3ffbb34ffabb0c540e6e9d76d034.exe

pid	process
3732	39475882127fd9789d9c23444153a4a4841f3ffbb34ffabb0c540e6e9d76d034.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

39475882127fd9789d9c23444153a4a4841f3ffbb34ffabb0c540e6e9d76d034.exe

description	pid	process	target process
PID 3732 wrote to memory of 3192	3732	39475882127fd9789d9c23444153a4a4841f3ffbb34ffabb0c540e6e9d76d034.exe	extrac32.exe
PID 3732 wrote to memory of 3192	3732	39475882127fd9789d9c23444153a4a4841f3ffbb34ffabb0c540e6e9d76d034.exe	extrac32.exe
PID 3732 wrote to memory of 3192	3732	39475882127fd9789d9c23444153a4a4841f3ffbb34ffabb0c540e6e9d76d034.exe	extrac32.exe

C:\Users\Admin\AppData\Local\Temp\39475882127fd9789d9c23444153a4a4841f3ffbb34ffabb0c540e6e9d76d034.exe
"C:\Users\Admin\AppData\Local\Temp\39475882127fd9789d9c23444153a4a4841f3ffbb34ffabb0c540e6e9d76d034.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3732

C:\Windows\SysWOW64\extrac32.exe
C:\\Windows\\System32\\extrac32.exe /C /Y C:\Users\Admin\AppData\Local\Temp\39475882127fd9789d9c23444153a4a4841f3ffbb34ffabb0c540e6e9d76d034.exe C:\\Users\\Public\\Libraries\\Efftwcmk.PIF
2⤵
PID:3192

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\notes\logs.dat

Filesize
144B

MD5
3a473183aa92ddef530af19ace95ce89

SHA1
ab6b384207815e05848cbf1309ad3eac428eb6d2

SHA256
f1bcc8d1781dee885d2c3f71b10a06388b35999d53692061ca10aa2f9baa9d4f

SHA512
3c9871ddd0283df88b47f9cec6184c15900c1097eef2da9152d503b3cc80d3d3ea8ea505b74d28f313a4d6603918ebe256a2780d599b73b46b2b42c89842d6b8

Download Submit
memory/3732-27-0x0000000033890000-0x0000000034890000-memory.dmp

Filesize
16.0MB

Download
memory/3732-20-0x0000000033890000-0x0000000034890000-memory.dmp

Filesize
16.0MB

Download
memory/3732-10-0x0000000033890000-0x0000000034890000-memory.dmp

Filesize
16.0MB

Download
memory/3732-11-0x0000000033890000-0x0000000034890000-memory.dmp

Filesize
16.0MB

Download
memory/3732-28-0x0000000033890000-0x0000000034890000-memory.dmp

Filesize
16.0MB

Download
memory/3732-1-0x0000000000400000-0x000000000055C000-memory.dmp

Filesize
1.4MB

Download
memory/3732-7-0x0000000033890000-0x0000000034890000-memory.dmp

Filesize
16.0MB

Download
memory/3732-0-0x0000000000880000-0x0000000000881000-memory.dmp

Filesize
4KB

Download
memory/3732-18-0x0000000033890000-0x0000000034890000-memory.dmp

Filesize
16.0MB

Download
memory/3732-35-0x0000000033890000-0x0000000034890000-memory.dmp

Filesize
16.0MB

Download
memory/3732-37-0x0000000033890000-0x0000000034890000-memory.dmp

Filesize
16.0MB

Download
memory/3732-45-0x0000000033890000-0x0000000034890000-memory.dmp

Filesize
16.0MB

Download
memory/3732-46-0x0000000033890000-0x0000000034890000-memory.dmp

Filesize
16.0MB

Download
memory/3732-53-0x0000000033890000-0x0000000034890000-memory.dmp

Filesize
16.0MB

Download
memory/3732-54-0x0000000033890000-0x0000000034890000-memory.dmp

Filesize
16.0MB

Download
memory/3732-61-0x0000000033890000-0x0000000034890000-memory.dmp

Filesize
16.0MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads