purecrypter | 0487dbe76c55bb13881635436dfc7fd3441075f2c8d57f64c462eac80325be2f

General

Target

file.exe
Size

17KB
MD5

d8848c4399130b94784433ee04c41e26
SHA1

d01aef8320666401111ca1276219a6cc773c954f
SHA256

0487dbe76c55bb13881635436dfc7fd3441075f2c8d57f64c462eac80325be2f
SHA512

5f4e285dd313f82e4153143d4719b99fd060807c2fa17a93d052aaff20b6c64971f7ad5e86f1cde135b4695504324af3bcbd616ad329c71b7ee4367d56bb0c48
SSDEEP

384:H3efq/2EA9UYLYp3bmjh/D2yrlffkxttF:06k/D2yrlffw

Score

10^/10

purecrypter collection downloader loader spyware stealer

Malware Config

Extracted

Family

purecrypter

C2

https://kosmikband.com/wtrash/Ygezyi.dat

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	file.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	file.exe
Key opened	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	file.exe
Key opened	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	file.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 5 IoCs

pid	Process
4740	powershell.exe
4740	powershell.exe
3476	file.exe
3476	file.exe
3476	file.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3476	file.exe
Token: SeDebugPrivilege	4740	powershell.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 3476 wrote to memory of 4740	3476	file.exe	83
PID 3476 wrote to memory of 4740	3476	file.exe	83
PID 3476 wrote to memory of 4740	3476	file.exe	83

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	file.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	file.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks computer location settings
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- outlook_office_path
- outlook_win_path
PID:3476
- 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:4740

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

3

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/3476-142-0x00000000081C0000-0x0000000008764000-memory.dmp

Filesize
5.6MB

Download
memory/3476-133-0x0000000007260000-0x0000000007282000-memory.dmp

Filesize
136KB

Download
memory/3476-146-0x0000000007B40000-0x0000000007B4A000-memory.dmp

Filesize
40KB

Download
memory/3476-145-0x0000000007E10000-0x0000000007EA2000-memory.dmp

Filesize
584KB

Download
memory/3476-144-0x00000000074A0000-0x00000000074F0000-memory.dmp

Filesize
320KB

Download
memory/3476-143-0x0000000006350000-0x00000000063EC000-memory.dmp

Filesize
624KB

Download
memory/3476-132-0x0000000000FB0000-0x0000000000FBA000-memory.dmp

Filesize
40KB

Download
memory/4740-138-0x0000000005940000-0x00000000059A6000-memory.dmp

Filesize
408KB

Download
memory/4740-140-0x0000000007730000-0x0000000007DAA000-memory.dmp

Filesize
6.5MB

Download
memory/4740-141-0x0000000006430000-0x000000000644A000-memory.dmp

Filesize
104KB

Download
memory/4740-139-0x0000000005F40000-0x0000000005F5E000-memory.dmp

Filesize
120KB

Download
memory/4740-137-0x0000000005860000-0x00000000058C6000-memory.dmp

Filesize
408KB

Download
memory/4740-136-0x0000000005160000-0x0000000005788000-memory.dmp

Filesize
6.2MB

Download
memory/4740-135-0x0000000004980000-0x00000000049B6000-memory.dmp

Filesize
216KB

Download

Analysis

Sharing