purecrypter | c5f1dfbf8d4b1d8d5c43f668292056d5b670fea174e6e79d3cc2ba341d66a21f

General

Target

setup.exe
Size

565.8MB
MD5

b34cf82d7d10a1c8421ef3fe65e4de46
SHA1

574c8dd9986952916786b03c0261230a933f3e9d
SHA256

7e73c496079d96e4ccec427679b791518f25aaca20585a5d54f632064ff880ae
SHA512

69fb1cb2e37c7b3321ff898aac936233521026834c07b92a7c8fa7885a363f5b2a6d6d455309435802f70827bc7ecb955ed9e4c7a8fdbcde212bc479748647ed
SSDEEP

1536:8rae78zjORCDGwfdCSog01313fs5gG8m:kahKyd2n31E5d

Score

10^/10

purecrypter downloader loader persistence

Malware Config

Extracted

Family

purecrypter

C2

https://speedysecurity.com.br/images/css/waves/bo/Upjcuf.bmp

Signatures

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

Executes dropped EXE 1 IoCs

pid	Process
1648	setup_ovl11.exe

Loads dropped DLL 5 IoCs

pid	Process
564	WerFault.exe
564	WerFault.exe
564	WerFault.exe
564	WerFault.exe
564	WerFault.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce	setup.exe
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\\\""	setup.exe

Program crash 1 IoCs

pid	pid_target	Process	procid_target
564	1648	WerFault.exe	28

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1648	setup_ovl11.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 1692 wrote to memory of 1648	1692	setup.exe	28
PID 1692 wrote to memory of 1648	1692	setup.exe	28
PID 1692 wrote to memory of 1648	1692	setup.exe	28
PID 1692 wrote to memory of 1648	1692	setup.exe	28
PID 1692 wrote to memory of 1648	1692	setup.exe	28
PID 1692 wrote to memory of 1648	1692	setup.exe	28
PID 1692 wrote to memory of 1648	1692	setup.exe	28
PID 1648 wrote to memory of 564	1648	setup_ovl11.exe	29
PID 1648 wrote to memory of 564	1648	setup_ovl11.exe	29
PID 1648 wrote to memory of 564	1648	setup_ovl11.exe	29
PID 1648 wrote to memory of 564	1648	setup_ovl11.exe	29

C:\Users\Admin\AppData\Local\Temp\setup.exe
"C:\Users\Admin\AppData\Local\Temp\setup.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1692
- C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ovl11.exe
  C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ovl11.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1648
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 1648 -s 1268
    3⤵
    - Loads dropped DLL
    - Program crash
    PID:564

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ovl11.exe

Filesize
362.4MB

MD5
86953017061f31e70b969e6c7f572c7f

SHA1
3bebe208120c374bc63b80b76d47caefabdca19a

SHA256
9412c0bf2b0d8f61bf6e8df011bd32f3a5be8a6d96bc0b0e4eee1bb3a43fe9da

SHA512
5a5afd57382e44034832f66d92b0d180d8e525ec4f22c54be4bf391604370814c622b4210e5f8f8c3c595dc63753d0dffc180ec1697a663a15598dae5491fa7c

Download Submit
C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ovl11.exe

Filesize
362.4MB

MD5
86953017061f31e70b969e6c7f572c7f

SHA1
3bebe208120c374bc63b80b76d47caefabdca19a

SHA256
9412c0bf2b0d8f61bf6e8df011bd32f3a5be8a6d96bc0b0e4eee1bb3a43fe9da

SHA512
5a5afd57382e44034832f66d92b0d180d8e525ec4f22c54be4bf391604370814c622b4210e5f8f8c3c595dc63753d0dffc180ec1697a663a15598dae5491fa7c

Download Submit
\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ovl11.exe

Filesize
362.4MB

MD5
86953017061f31e70b969e6c7f572c7f

SHA1
3bebe208120c374bc63b80b76d47caefabdca19a

SHA256
9412c0bf2b0d8f61bf6e8df011bd32f3a5be8a6d96bc0b0e4eee1bb3a43fe9da

SHA512
5a5afd57382e44034832f66d92b0d180d8e525ec4f22c54be4bf391604370814c622b4210e5f8f8c3c595dc63753d0dffc180ec1697a663a15598dae5491fa7c

Download Submit
\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ovl11.exe

Filesize
362.4MB

MD5
86953017061f31e70b969e6c7f572c7f

SHA1
3bebe208120c374bc63b80b76d47caefabdca19a

SHA256
9412c0bf2b0d8f61bf6e8df011bd32f3a5be8a6d96bc0b0e4eee1bb3a43fe9da

SHA512
5a5afd57382e44034832f66d92b0d180d8e525ec4f22c54be4bf391604370814c622b4210e5f8f8c3c595dc63753d0dffc180ec1697a663a15598dae5491fa7c

Download Submit
\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ovl11.exe

Filesize
362.4MB

MD5
86953017061f31e70b969e6c7f572c7f

SHA1
3bebe208120c374bc63b80b76d47caefabdca19a

SHA256
9412c0bf2b0d8f61bf6e8df011bd32f3a5be8a6d96bc0b0e4eee1bb3a43fe9da

SHA512
5a5afd57382e44034832f66d92b0d180d8e525ec4f22c54be4bf391604370814c622b4210e5f8f8c3c595dc63753d0dffc180ec1697a663a15598dae5491fa7c

Download Submit
\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ovl11.exe

Filesize
362.4MB

MD5
86953017061f31e70b969e6c7f572c7f

SHA1
3bebe208120c374bc63b80b76d47caefabdca19a

SHA256
9412c0bf2b0d8f61bf6e8df011bd32f3a5be8a6d96bc0b0e4eee1bb3a43fe9da

SHA512
5a5afd57382e44034832f66d92b0d180d8e525ec4f22c54be4bf391604370814c622b4210e5f8f8c3c595dc63753d0dffc180ec1697a663a15598dae5491fa7c

Download Submit
\Users\Admin\AppData\Local\Temp\IXP000.TMP\setup_ovl11.exe

Filesize
362.4MB

MD5
86953017061f31e70b969e6c7f572c7f

SHA1
3bebe208120c374bc63b80b76d47caefabdca19a

SHA256
9412c0bf2b0d8f61bf6e8df011bd32f3a5be8a6d96bc0b0e4eee1bb3a43fe9da

SHA512
5a5afd57382e44034832f66d92b0d180d8e525ec4f22c54be4bf391604370814c622b4210e5f8f8c3c595dc63753d0dffc180ec1697a663a15598dae5491fa7c

Download Submit
memory/1648-60-0x00000000000B0000-0x00000000000B8000-memory.dmp

Filesize
32KB

Download
memory/1648-61-0x0000000004210000-0x0000000004250000-memory.dmp

Filesize
256KB

Download
memory/1648-66-0x0000000004210000-0x0000000004250000-memory.dmp

Filesize
256KB

Download

Analysis

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