purecrypter | 03541b2cf3bf022eda584b9ead6b6edeb7a47e8ccaa99b2415ee56694c9868cb

General

Target

tmp.exe
Size

2.7MB
MD5

21605edd439a91f69b7c2584413ae3f5
SHA1

76353ff45df865cee24b8802c2332c8f07590df6
SHA256

03541b2cf3bf022eda584b9ead6b6edeb7a47e8ccaa99b2415ee56694c9868cb
SHA512

df4248687d7a92389a3aab90dd0ccc8ea7236e8b71555bd835c33816a6e27b9a147d10fe693b57a693698c0d7c3fdbd99a3587cbfba08929c0d0fc4f34efb128
SSDEEP

49152:Q61jlIn2e7zgWTSOa7Q4hVBP35NxVg1DHeTz0CTssEORTdQRYdN+1rHzE42i9:Q6FynB7JTSOWBBNxVg1zen0CLEOhdQTl

Score

10^/10

purecrypter remcos nigeria downloader loader rat

Malware Config

Extracted

Family

remcos

Botnet

nigeria

C2

198.46.173.141:50482

198.46.173.141:50484

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
remcos
mouse_option
false
mutex
Rmc-6CYNGG
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

Signatures

Detect PureCrypter injector 1 IoCs

loader

Processes:

resource	yara_rule
behavioral1/memory/836-55-0x0000000004D50000-0x0000000005000000-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
Suspicious use of SetThreadContext 1 IoCs

Processes:

tmp.exe

description pid process target process

PID 836 set thread context of 1216 836 tmp.exe tmp.exe
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 1 IoCs

Processes:

powershell.exe

pid process

1668 powershell.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

tmp.exepowershell.exe

description pid process

Token: SeDebugPrivilege 836 tmp.exe
Token: SeDebugPrivilege 1668 powershell.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

tmp.exe

pid process

1216 tmp.exe

description	pid	process	target process
PID 836 set thread context of 1216	836	tmp.exe	tmp.exe

pid	process
1668	powershell.exe

description	pid	process
Token: SeDebugPrivilege	836	tmp.exe
Token: SeDebugPrivilege	1668	powershell.exe

pid	process
1216	tmp.exe

Suspicious use of WriteProcessMemory 20 IoCs

Processes:

tmp.exe

description	pid	process	target process
PID 836 wrote to memory of 1668	836	tmp.exe	powershell.exe
PID 836 wrote to memory of 1668	836	tmp.exe	powershell.exe
PID 836 wrote to memory of 1668	836	tmp.exe	powershell.exe
PID 836 wrote to memory of 1668	836	tmp.exe	powershell.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe
PID 836 wrote to memory of 1216	836	tmp.exe	tmp.exe

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:836

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:1668

C:\Users\Admin\AppData\Local\Temp\tmp.exe
C:\Users\Admin\AppData\Local\Temp\tmp.exe
2⤵
- Suspicious use of SetWindowsHookEx
PID:1216

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/836-62-0x0000000002470000-0x00000000024F0000-memory.dmp

Filesize
512KB

Download
memory/836-55-0x0000000004D50000-0x0000000005000000-memory.dmp

Filesize
2.7MB

Download
memory/836-56-0x0000000075A11000-0x0000000075A13000-memory.dmp

Filesize
8KB

Download
memory/836-54-0x0000000000DA0000-0x0000000001052000-memory.dmp

Filesize
2.7MB

Download
memory/1216-73-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1216-70-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1216-81-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1216-80-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1216-63-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1216-64-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1216-66-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1216-68-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1216-69-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1216-79-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1216-71-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1216-75-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/1216-76-0x0000000000432E48-mapping.dmp

Download
memory/1668-57-0x0000000000000000-mapping.dmp

Download
memory/1668-60-0x000000006F440000-0x000000006F9EB000-memory.dmp

Filesize
5.7MB

Download
memory/1668-59-0x000000006F440000-0x000000006F9EB000-memory.dmp

Filesize
5.7MB

Download
memory/1668-61-0x000000006F440000-0x000000006F9EB000-memory.dmp

Filesize
5.7MB

Download

Analysis

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