purecrypter | 4134bd82bbea78103d0e32728df856870eaa2c0188b59423115c7d779b2bf83a

Analysis

max time kernel
194s
max time network
205s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
03-02-2023 18:54

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General

Target

tmp.exe
Size

6KB
MD5

679104fb0479ff61c4b5e4b88f77d94b
SHA1

bfbcb5d48fb4ab25d52e4e1bedf37a4e7a4a3cab
SHA256

4134bd82bbea78103d0e32728df856870eaa2c0188b59423115c7d779b2bf83a
SHA512

7cb36200865267885939956614a7b8603cd16575a3857e0ecc238ff22d296b29bfb208bb11f61f3856278f6b4585afdb2c8456d2f2630f0fbc33fa298df0253e
SSDEEP

192:zU3efq7iEM9gdH98dfQbLE5lF22vjWwID:Q3efq7iEM9gdH98dfgLE5lI2vjlI

Score

10^/10

purecrypter downloader loader

Malware Config

Extracted

Family

purecrypter

https://onedrive.live.com/download?cid=A113DD34A0D77810&resid=A113DD34A0D77810%21125&authkey=AIgE8y9D-kUp_qA

Signatures

PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
loader downloader purecrypter

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-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	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 2 IoCs

pid	Process
2640	powershell.exe
2640	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5068	tmp.exe
Token: SeDebugPrivilege	2640	powershell.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 5068 wrote to memory of 2640	5068	tmp.exe	86
PID 5068 wrote to memory of 2640	5068	tmp.exe	86
PID 5068 wrote to memory of 2640	5068	tmp.exe	86

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5068
- 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:2640

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/2640-135-0x00000000025D0000-0x0000000002606000-memory.dmp

Filesize
216KB

Download
memory/2640-136-0x0000000004EA0000-0x00000000054C8000-memory.dmp

Filesize
6.2MB

Download
memory/2640-137-0x00000000054D0000-0x0000000005536000-memory.dmp

Filesize
408KB

Download
memory/2640-138-0x0000000005540000-0x00000000055A6000-memory.dmp

Filesize
408KB

Download
memory/2640-139-0x0000000005BB0000-0x0000000005BCE000-memory.dmp

Filesize
120KB

Download
memory/2640-140-0x0000000007210000-0x000000000788A000-memory.dmp

Filesize
6.5MB

Download
memory/2640-141-0x0000000006060000-0x000000000607A000-memory.dmp

Filesize
104KB

Download
memory/5068-132-0x0000000000810000-0x0000000000818000-memory.dmp

Filesize
32KB

Download
memory/5068-133-0x0000000006240000-0x0000000006262000-memory.dmp

Filesize
136KB

Download