purecrypter | 6f6ee24d416bffaefa0123fcc822ac8c66f44d4daa0aba3e19fb5802bfed9664

Analysis

max time kernel
97s
max time network
136s
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 01:46

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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

3168 SETUP_~1.EXE

pid	process
3168	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 target process

4340 3168 WerFault.exe SETUP_~1.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:

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 3168 SETUP_~1.EXE

pid	pid_target	process	target process
4340	3168	WerFault.exe	SETUP_~1.EXE

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

description	pid	process
Token: SeDebugPrivilege	3168	SETUP_~1.EXE

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

7d41dd6194db2b9b1514ad154451bb7a.exe

description	pid	process	target process
PID 2236 wrote to memory of 3168	2236	7d41dd6194db2b9b1514ad154451bb7a.exe	SETUP_~1.EXE
PID 2236 wrote to memory of 3168	2236	7d41dd6194db2b9b1514ad154451bb7a.exe	SETUP_~1.EXE
PID 2236 wrote to memory of 3168	2236	7d41dd6194db2b9b1514ad154451bb7a.exe	SETUP_~1.EXE

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:2236
- 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:3168
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3168 -s 1688
    3⤵
    - Program crash
    PID:4340

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3168 -ip 3168
1⤵
PID:244

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/3168-5-0x00000000750AE000-0x00000000750AF000-memory.dmp

Filesize
4KB

Download
memory/3168-6-0x0000000000A20000-0x0000000000A28000-memory.dmp

Filesize
32KB

Download
memory/3168-7-0x00000000750A0000-0x0000000075850000-memory.dmp

Filesize
7.7MB

Download
memory/3168-8-0x00000000750A0000-0x0000000075850000-memory.dmp

Filesize
7.7MB

Download