purecrypter | 6f6ee24d416bffaefa0123fcc822ac8c66f44d4daa0aba3e19fb5802bfed9664

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
08-11-2024 15:01

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General

Target

7d41dd6194db2b9b1514ad154451bb7a.exe
Size

383KB
MD5

7d41dd6194db2b9b1514ad154451bb7a
SHA1

3c2597920f384ee5152754e410594c078bc14fe5
SHA256

a5d3a4578fd5979a7e3fe324b7c329e5b853c1c739e73428d77ade897c113e44
SHA512

f32284fb34ac82dab3f88c110b51c3ffbf8b6705a96cc472c05dfe083a25ccd9ea3695590d577236f40f5f55778712a4f74251a05056249c31cfe8a7f3182019
SSDEEP

768:kSvNWMz7EVXU/hVJ+7hSYfGJsQO849wk9ESnGCuqqyUq60atL+Qs1eIeRgiSlmmu:VI47GyTGCwiSnmQUt0LB1eIus5gDB

Score

10^/10

purecrypter discovery downloader loader persistence

Malware Config

Extracted

Family

purecrypter

https://megalinkbj.com.br/images/img/css/www/soul/EitherInstitution_1_Cpoenwyi.jpg

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:

SETUP_~1.EXE

pid	Process
1628	SETUP_~1.EXE

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

7d41dd6194db2b9b1514ad154451bb7a.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\\\""	7d41dd6194db2b9b1514ad154451bb7a.exe

Program crash 1 IoCs

Processes:

WerFault.exe

pid	pid_target	Process	procid_target
3520	1628	WerFault.exe	86

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:

SETUP_~1.EXE

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	SETUP_~1.EXE

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

SETUP_~1.EXE

description	pid	Process
Token: SeDebugPrivilege	1628	SETUP_~1.EXE

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

7d41dd6194db2b9b1514ad154451bb7a.exe

description	pid	Process	procid_target
PID 5044 wrote to memory of 1628	5044	7d41dd6194db2b9b1514ad154451bb7a.exe	86
PID 5044 wrote to memory of 1628	5044	7d41dd6194db2b9b1514ad154451bb7a.exe	86
PID 5044 wrote to memory of 1628	5044	7d41dd6194db2b9b1514ad154451bb7a.exe	86

C:\Users\Admin\AppData\Local\Temp\7d41dd6194db2b9b1514ad154451bb7a.exe
"C:\Users\Admin\AppData\Local\Temp\7d41dd6194db2b9b1514ad154451bb7a.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:5044
- C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\SETUP_~1.EXE
  C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\SETUP_~1.EXE
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:1628
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 1628 -s 1676
    3⤵
    - Program crash
    PID:3520

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 1628 -ip 1628
1⤵
PID:3944

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

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Downloads

memory/1628-5-0x000000007536E000-0x000000007536F000-memory.dmp

Filesize
4KB

Download
memory/1628-6-0x0000000000010000-0x0000000000018000-memory.dmp

Filesize
32KB

Download
memory/1628-7-0x0000000075360000-0x0000000075B10000-memory.dmp

Filesize
7.7MB

Download
memory/1628-8-0x0000000075360000-0x0000000075B10000-memory.dmp

Filesize
7.7MB

Download