purecrypter | 0492e86e9f32847a07e11519c5833035b85a85473777de0c1c558e53a019e3c0

General

Target

Mhiwfmlub.exe
Size

446KB
MD5

c4869d1471e76a3efa87816ad5ebfec3
SHA1

dd0cc24265371721bd1eb383ce3f460081074763
SHA256

92767f44cc14eeed6919d8b3c214d63d1e9fb72439d9f6a662a4a595d8512b3b
SHA512

1b664fd1eca97d224d64d4d050cdba3a8cebc8fa51c2bc59640ea5eb46e1352cc65cc51c8aab7ee5ea2e9e70f803325fb87f2188e55caf84f227252396542fc0
SSDEEP

12288:BBJooIJUl95lJVfWkAy2KcwsDInlhm3tur8KgQUg:HyVgXlJ9WkAf5Ibm9u4oUg

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/1356-55-0x0000000000490000-0x0000000000500000-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-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\Cjkftmvp = "\"C:\\Users\\Admin\\AppData\\Roaming\\Znpyrvobkvt\\Cjkftmvp.exe\""	Mhiwfmlub.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1356 set thread context of 1176	1356	Mhiwfmlub.exe	28

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

pid	Process
1296	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1296	powershell.exe
Token: SeDebugPrivilege	1356	Mhiwfmlub.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1356 wrote to memory of 1296	1356	Mhiwfmlub.exe	26
PID 1356 wrote to memory of 1296	1356	Mhiwfmlub.exe	26
PID 1356 wrote to memory of 1296	1356	Mhiwfmlub.exe	26
PID 1356 wrote to memory of 1296	1356	Mhiwfmlub.exe	26
PID 1356 wrote to memory of 1176	1356	Mhiwfmlub.exe	28
PID 1356 wrote to memory of 1176	1356	Mhiwfmlub.exe	28
PID 1356 wrote to memory of 1176	1356	Mhiwfmlub.exe	28
PID 1356 wrote to memory of 1176	1356	Mhiwfmlub.exe	28
PID 1356 wrote to memory of 1176	1356	Mhiwfmlub.exe	28
PID 1356 wrote to memory of 1176	1356	Mhiwfmlub.exe	28
PID 1356 wrote to memory of 1176	1356	Mhiwfmlub.exe	28
PID 1356 wrote to memory of 1176	1356	Mhiwfmlub.exe	28
PID 1356 wrote to memory of 1176	1356	Mhiwfmlub.exe	28
PID 1356 wrote to memory of 1176	1356	Mhiwfmlub.exe	28
PID 1356 wrote to memory of 1176	1356	Mhiwfmlub.exe	28

C:\Users\Admin\AppData\Local\Temp\Mhiwfmlub.exe
"C:\Users\Admin\AppData\Local\Temp\Mhiwfmlub.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1356
- 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:1296
- C:\Users\Admin\AppData\Local\Temp\Mhiwfmlub.exe
  C:\Users\Admin\AppData\Local\Temp\Mhiwfmlub.exe
  2⤵
  PID:1176

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/1176-69-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1176-68-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1176-64-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1176-66-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1176-63-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1176-76-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1176-72-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1176-77-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1176-70-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/1296-60-0x000000006EB60000-0x000000006F10B000-memory.dmp

Filesize
5.7MB

Download
memory/1296-62-0x000000006EB60000-0x000000006F10B000-memory.dmp

Filesize
5.7MB

Download
memory/1296-61-0x000000006EB60000-0x000000006F10B000-memory.dmp

Filesize
5.7MB

Download
memory/1356-57-0x0000000075091000-0x0000000075093000-memory.dmp

Filesize
8KB

Download
memory/1356-54-0x0000000000D00000-0x0000000000D76000-memory.dmp

Filesize
472KB

Download
memory/1356-56-0x0000000004970000-0x0000000004A02000-memory.dmp

Filesize
584KB

Download
memory/1356-55-0x0000000000490000-0x0000000000500000-memory.dmp

Filesize
448KB

Download

Analysis

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