purecrypter | 1a42950011efa48efad99c53904d84f0d89ee37077edce320f9781a68cfa9c4f

General

Target

Mwqtxjbh.exe
Size

1.2MB
MD5

ecaf214bde2e9e856ff914ff601323eb
SHA1

b20382c8f2337277c3467b07f395cda96827f497
SHA256

1a42950011efa48efad99c53904d84f0d89ee37077edce320f9781a68cfa9c4f
SHA512

fe6de7336f518c0826b2fcf2769a2639c57a3efd43f8d7a1b572229ebe234cb21199e7c973b301c47d48715926c46db0a8d3197fe680e5fd67295aae907efcac
SSDEEP

24576:TLz3VowLzh0xOxua+8uTUcQTWTbh9/+rHZ8zZQ6gqtQkBMATHXUelVE6:jVzl453DXQTZre9QRqtNRX7

Score

10^/10

purecrypter remcos mimiboy downloader loader persistence rat

Malware Config

Extracted

Family

remcos

Version

2.7.1 Pro

Botnet

MIMIBOY

C2

91.231.84.41:52651

127.0.0.1:52651

10.5.175.21:52651

Attributes

audio_folder
MicRecords
audio_path
%AppData%
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
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
Remcos-SURYWD
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Remcos
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
wikipedia;solitaire;

Signatures

Detect PureCrypter injector 1 IoCs

loader

resource	yara_rule
behavioral1/memory/1264-55-0x0000000004E50000-0x00000000050BA000-memory.dmp	family_purecrypter

PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
loader downloader purecrypter
Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\Software\Microsoft\Windows\CurrentVersion\Run\Snmqo = "\"C:\\Users\\Admin\\AppData\\Roaming\\Wbnjnlwiifu\\Snmqo.exe\""	Mwqtxjbh.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1264 set thread context of 1792	1264	Mwqtxjbh.exe	31

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
996	powershell.exe
1264	Mwqtxjbh.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1264	Mwqtxjbh.exe
Token: SeDebugPrivilege	996	powershell.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 1264 wrote to memory of 996	1264	Mwqtxjbh.exe	28
PID 1264 wrote to memory of 996	1264	Mwqtxjbh.exe	28
PID 1264 wrote to memory of 996	1264	Mwqtxjbh.exe	28
PID 1264 wrote to memory of 996	1264	Mwqtxjbh.exe	28
PID 1264 wrote to memory of 1800	1264	Mwqtxjbh.exe	30
PID 1264 wrote to memory of 1800	1264	Mwqtxjbh.exe	30
PID 1264 wrote to memory of 1800	1264	Mwqtxjbh.exe	30
PID 1264 wrote to memory of 1800	1264	Mwqtxjbh.exe	30
PID 1264 wrote to memory of 1792	1264	Mwqtxjbh.exe	31
PID 1264 wrote to memory of 1792	1264	Mwqtxjbh.exe	31
PID 1264 wrote to memory of 1792	1264	Mwqtxjbh.exe	31
PID 1264 wrote to memory of 1792	1264	Mwqtxjbh.exe	31
PID 1264 wrote to memory of 1792	1264	Mwqtxjbh.exe	31
PID 1264 wrote to memory of 1792	1264	Mwqtxjbh.exe	31
PID 1264 wrote to memory of 1792	1264	Mwqtxjbh.exe	31
PID 1264 wrote to memory of 1792	1264	Mwqtxjbh.exe	31
PID 1264 wrote to memory of 1792	1264	Mwqtxjbh.exe	31
PID 1264 wrote to memory of 1792	1264	Mwqtxjbh.exe	31
PID 1264 wrote to memory of 1792	1264	Mwqtxjbh.exe	31

C:\Users\Admin\AppData\Local\Temp\Mwqtxjbh.exe
"C:\Users\Admin\AppData\Local\Temp\Mwqtxjbh.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1264
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:996
- C:\Users\Admin\AppData\Local\Temp\Mwqtxjbh.exe
  C:\Users\Admin\AppData\Local\Temp\Mwqtxjbh.exe
  2⤵
  PID:1800
- C:\Users\Admin\AppData\Local\Temp\Mwqtxjbh.exe
  C:\Users\Admin\AppData\Local\Temp\Mwqtxjbh.exe
  2⤵
  PID:1792

Network

MITRE ATT&CK Enterprise 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

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/996-59-0x000000006F300000-0x000000006F8AB000-memory.dmp

Filesize
5.7MB

Download
memory/996-60-0x000000006F300000-0x000000006F8AB000-memory.dmp

Filesize
5.7MB

Download
memory/996-61-0x000000006F300000-0x000000006F8AB000-memory.dmp

Filesize
5.7MB

Download
memory/1264-54-0x0000000000140000-0x0000000000278000-memory.dmp

Filesize
1.2MB

Download
memory/1264-55-0x0000000004E50000-0x00000000050BA000-memory.dmp

Filesize
2.4MB

Download
memory/1264-56-0x0000000075291000-0x0000000075293000-memory.dmp

Filesize
8KB

Download
memory/1264-62-0x0000000004430000-0x000000000447E000-memory.dmp

Filesize
312KB

Download
memory/1792-63-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1792-64-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1792-66-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1792-69-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1792-68-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1792-70-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1792-72-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1792-76-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1792-77-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download

Analysis

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