purecrypter | 752e7d326d94fefa12869bee8c54bfb197d193f151d72f936457a27bbd6b6877

Analysis

max time kernel
47s
max time network
50s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
03-02-2023 18:53

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General

Target

Loader.exe
Size

1.6MB
MD5

a44e526804469076d712e8a05ddd7759
SHA1

7010fda540e70139020a7a79730e74e99bd8e6c9
SHA256

46d7128963bde013c8ec359b285e47eabbf9c88e332735e02ced518773e8e95f
SHA512

04c40ef00c80d641c4f7bced8aefc180d695ea23ef79e272167f1a567484be2ab7031ca55a246cbeba1ed0c0ed93223fc2a33daed7f2048c62f169f0e6325b36
SSDEEP

49152:fBvdZG5o8InNXL9Qn0HpZjI64n2hcyfT2:pFZG5oNnRfh9

Score

10^/10

purecrypter downloader loader persistence

Malware Config

Signatures

Detect PureCrypter injector 1 IoCs

loader

resource	yara_rule
behavioral1/memory/1084-55-0x000000001BF90000-0x000000001C268000-memory.dmp	family_purecrypter

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe,\"C:\\Users\\Admin\\AppData\\Roaming\\Google\\Chrome.exe\","	Loader.exe

PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
loader downloader purecrypter
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Modifies system certificate store 2 TTPs 2 IoCs

evasion spyware trojan

Install Root Certificate

T1130

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D4DE20D05E66FC53FE1A50882C78DB2852CAE474	Loader.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D4DE20D05E66FC53FE1A50882C78DB2852CAE474\Blob = 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	Loader.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
1388	powershell.exe
1084	Loader.exe
1084	Loader.exe
1084	Loader.exe
1084	Loader.exe
1084	Loader.exe
1084	Loader.exe
1084	Loader.exe
1084	Loader.exe
1084	Loader.exe
1084	Loader.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1388	powershell.exe
Token: SeDebugPrivilege	1084	Loader.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 1084 wrote to memory of 1388	1084	Loader.exe	27
PID 1084 wrote to memory of 1388	1084	Loader.exe	27
PID 1084 wrote to memory of 1388	1084	Loader.exe	27
PID 1084 wrote to memory of 1736	1084	Loader.exe	29
PID 1084 wrote to memory of 1736	1084	Loader.exe	29
PID 1084 wrote to memory of 1736	1084	Loader.exe	29
PID 1084 wrote to memory of 1752	1084	Loader.exe	30
PID 1084 wrote to memory of 1752	1084	Loader.exe	30
PID 1084 wrote to memory of 1752	1084	Loader.exe	30
PID 1084 wrote to memory of 1740	1084	Loader.exe	31
PID 1084 wrote to memory of 1740	1084	Loader.exe	31
PID 1084 wrote to memory of 1740	1084	Loader.exe	31
PID 1084 wrote to memory of 1756	1084	Loader.exe	32
PID 1084 wrote to memory of 1756	1084	Loader.exe	32
PID 1084 wrote to memory of 1756	1084	Loader.exe	32
PID 1084 wrote to memory of 988	1084	Loader.exe	33
PID 1084 wrote to memory of 988	1084	Loader.exe	33
PID 1084 wrote to memory of 988	1084	Loader.exe	33
PID 1084 wrote to memory of 1520	1084	Loader.exe	34
PID 1084 wrote to memory of 1520	1084	Loader.exe	34
PID 1084 wrote to memory of 1520	1084	Loader.exe	34
PID 1084 wrote to memory of 1236	1084	Loader.exe	35
PID 1084 wrote to memory of 1236	1084	Loader.exe	35
PID 1084 wrote to memory of 1236	1084	Loader.exe	35
PID 1084 wrote to memory of 1868	1084	Loader.exe	36
PID 1084 wrote to memory of 1868	1084	Loader.exe	36
PID 1084 wrote to memory of 1868	1084	Loader.exe	36
PID 1084 wrote to memory of 532	1084	Loader.exe	37
PID 1084 wrote to memory of 532	1084	Loader.exe	37
PID 1084 wrote to memory of 532	1084	Loader.exe	37
PID 1084 wrote to memory of 752	1084	Loader.exe	38
PID 1084 wrote to memory of 752	1084	Loader.exe	38
PID 1084 wrote to memory of 752	1084	Loader.exe	38

C:\Users\Admin\AppData\Local\Temp\Loader.exe
"C:\Users\Admin\AppData\Local\Temp\Loader.exe"
1⤵
- Modifies WinLogon for persistence
- Modifies system certificate store
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1084
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMwAyAA==
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1388
- C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  2⤵
  PID:1736
- C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  2⤵
  PID:1752
- C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  2⤵
  PID:1740
- C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  2⤵
  PID:1756
- C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  2⤵
  PID:988
- C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  2⤵
  PID:1520
- C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  2⤵
  PID:1236
- C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  2⤵
  PID:1868
- C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  2⤵
  PID:532
- C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
  2⤵
  PID:752

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Install Root Certificate

T1130

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1084-63-0x0000000001177000-0x0000000001196000-memory.dmp

Filesize
124KB

Download
memory/1084-55-0x000000001BF90000-0x000000001C268000-memory.dmp

Filesize
2.8MB

Download
memory/1084-56-0x0000000001177000-0x0000000001196000-memory.dmp

Filesize
124KB

Download
memory/1084-54-0x0000000001210000-0x00000000013B2000-memory.dmp

Filesize
1.6MB

Download
memory/1084-66-0x0000000001177000-0x0000000001196000-memory.dmp

Filesize
124KB

Download
memory/1084-65-0x000000001C780000-0x000000001C83C000-memory.dmp

Filesize
752KB

Download
memory/1388-61-0x00000000023C4000-0x00000000023C7000-memory.dmp

Filesize
12KB

Download
memory/1388-62-0x00000000023CB000-0x00000000023EA000-memory.dmp

Filesize
124KB

Download
memory/1388-60-0x000007FEEBA30000-0x000007FEEC58D000-memory.dmp

Filesize
11.4MB

Download
memory/1388-64-0x00000000023CB000-0x00000000023EA000-memory.dmp

Filesize
124KB

Download
memory/1388-59-0x000007FEEC590000-0x000007FEECFB3000-memory.dmp

Filesize
10.1MB

Download
memory/1388-58-0x000007FEFB761000-0x000007FEFB763000-memory.dmp

Filesize
8KB

Download