purecrypter | fadceca1e82b639dc996d7f6e453d7c9010193b5d8e9dafce58674a456411e9d

Analysis

max time kernel
128s
max time network
157s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
04-11-2024 15:09

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

NewDocument002.pdf.exe
Size

668.1MB
MD5

d889fc82620f1cb402b8de785364e6a3
SHA1

f459f585dbffe403086eaeeb68ee78cf26eeee08
SHA256

f8a9e3b0e40f55e363161472b1ae42f699f14d8251685270be41a6f45d567ac6
SHA512

b1b19a1cc7f893244b5f8d67b5d8e0ede984de7d7ced46c630236373e32193805cb65bd583ec3bf361354a79c291316f1aca68c30d0d9f92a3fc95911b7f3c69
SSDEEP

1536:Prae78zjORCDGwfdCSog01313is5g8HiQWoOA:lahKyd2n31b5zHCoOA

Score

10^/10

purecrypter discovery downloader loader persistence

Malware Config

Extracted

Family

purecrypter

https://andit.co/pharma/app/icon/pharma/SeemOffice_Jsbzsevl.png

Signatures

PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
loader downloader purecrypter
Purecrypter family
purecrypter
Executes dropped EXE 1 IoCs

Processes:

looptoolov.exe

pid process

5024 looptoolov.exe

pid	process
5024	looptoolov.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

NewDocument002.pdf.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\wextract_cleanup0 = "rundll32.exe C:\\Windows\\system32\\advpack.dll,DelNodeRunDLL32 \"C:\\Users\\Admin\\AppData\\Local\\Temp\\IXP000.TMP\\\""	NewDocument002.pdf.exe

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
discovery

System Language Discovery
T1614.001

Processes:

looptoolov.exe

description ioc process

Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language looptoolov.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

looptoolov.exe

description pid process

Token: SeDebugPrivilege 5024 looptoolov.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	looptoolov.exe

description	pid	process
Token: SeDebugPrivilege	5024	looptoolov.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

NewDocument002.pdf.exe

description	pid	process	target process
PID 4848 wrote to memory of 5024	4848	NewDocument002.pdf.exe	looptoolov.exe
PID 4848 wrote to memory of 5024	4848	NewDocument002.pdf.exe	looptoolov.exe
PID 4848 wrote to memory of 5024	4848	NewDocument002.pdf.exe	looptoolov.exe

C:\Users\Admin\AppData\Local\Temp\NewDocument002.pdf.exe
"C:\Users\Admin\AppData\Local\Temp\NewDocument002.pdf.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:4848
- C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\looptoolov.exe
  C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\looptoolov.exe
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:5024

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/5024-5-0x000000007484E000-0x000000007484F000-memory.dmp

Filesize
4KB

Download
memory/5024-6-0x0000000000DE0000-0x0000000000DE8000-memory.dmp

Filesize
32KB

Download
memory/5024-7-0x0000000074840000-0x0000000074FF0000-memory.dmp

Filesize
7.7MB

Download
memory/5024-8-0x000000007484E000-0x000000007484F000-memory.dmp

Filesize
4KB

Download
memory/5024-9-0x0000000074840000-0x0000000074FF0000-memory.dmp

Filesize
7.7MB

Download