purecrypter | 47fb3f47c7d8d30d6bc605805e10fa9c60af5c0516b93e475c030da9144a715d

Analysis

max time kernel
149s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
16/02/2023, 07:24

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General

Target
file.exe
Size 23KB
Sample230216-h8dpcsgd79
SHA256 47fb3f47c7d8d30d6bc605805e10fa9c60af5c0516b93e475c030da9144a715d
MD5 4a5b45207512b2f4ee3bd8cd7a25ba9e
SHA1 2700be565b25a627c86adf20798e90e99958a3ea
SHA512 a1e26da024c534083fde7dee2846973489ceb06c536a751bde47fa74977efe5ab3762bd8f82bc427800eb43ee9e56064dcbd755d00454c2be112cdd04eb2e4ce
SSDEEP 384:YbrFmwPzQHzVZJq/S8frSo62tCT+UuSvwiFawG:Ah2HzIfrS8fiFa/
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

purecrypter remcos remotehost downloader loader rat

Malware Config

Extracted

Family

purecrypter

https://onedrive.live.com/download?cid=BD9480D014FE52E5&resid=BD9480D014FE52E5%21385&authkey=AB7WYGSbxFgcTyw

Extracted

Family

remcos

Botnet

RemoteHost

185.189.112.27:30544

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-C12GMX
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

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

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	file.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4056 set thread context of 3372	4056	file.exe	88

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 4 IoCs

pid	Process
4436	powershell.exe
4436	powershell.exe
4056	file.exe
4056	file.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4056	file.exe
Token: SeDebugPrivilege	4436	powershell.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 4056 wrote to memory of 4436	4056	file.exe	79
PID 4056 wrote to memory of 4436	4056	file.exe	79
PID 4056 wrote to memory of 4436	4056	file.exe	79
PID 4056 wrote to memory of 3540	4056	file.exe	87
PID 4056 wrote to memory of 3540	4056	file.exe	87
PID 4056 wrote to memory of 3540	4056	file.exe	87
PID 4056 wrote to memory of 3372	4056	file.exe	88
PID 4056 wrote to memory of 3372	4056	file.exe	88
PID 4056 wrote to memory of 3372	4056	file.exe	88
PID 4056 wrote to memory of 3372	4056	file.exe	88
PID 4056 wrote to memory of 3372	4056	file.exe	88
PID 4056 wrote to memory of 3372	4056	file.exe	88
PID 4056 wrote to memory of 3372	4056	file.exe	88
PID 4056 wrote to memory of 3372	4056	file.exe	88
PID 4056 wrote to memory of 3372	4056	file.exe	88
PID 4056 wrote to memory of 3372	4056	file.exe	88
PID 4056 wrote to memory of 3372	4056	file.exe	88
PID 4056 wrote to memory of 3372	4056	file.exe	88

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4056
- 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:4436
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  2⤵
  PID:3540
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  2⤵
  PID:3372

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/3372-148-0x0000000000400000-0x0000000000480000-memory.dmp

Download

memory/3372-147-0x0000000000400000-0x0000000000480000-memory.dmp

Download

memory/3372-146-0x0000000000400000-0x0000000000480000-memory.dmp

Download

memory/3372-145-0x0000000000400000-0x0000000000480000-memory.dmp

Download

memory/3372-144-0x0000000000400000-0x0000000000480000-memory.dmp

Download

memory/4056-133-0x0000000006B20000-0x0000000006B42000-memory.dmp

Download

memory/4056-132-0x0000000000AE0000-0x0000000000AEC000-memory.dmp

Download

memory/4436-136-0x0000000004CE0000-0x0000000005308000-memory.dmp

Download

memory/4436-141-0x0000000005F40000-0x0000000005F5A000-memory.dmp

Download

memory/4436-140-0x00000000072A0000-0x000000000791A000-memory.dmp

Download

memory/4436-139-0x0000000005A40000-0x0000000005A5E000-memory.dmp

Download

memory/4436-138-0x0000000005400000-0x0000000005466000-memory.dmp

Download

memory/4436-137-0x0000000004C10000-0x0000000004C76000-memory.dmp

Download

memory/4436-135-0x0000000002460000-0x0000000002496000-memory.dmp

Download