purecrypter | 850f818aca36188fff35a492275cd63ba81f6e48263faa669fb5e192165f2f92

Analysis

max time kernel
151s
max time network
155s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
27/01/2023, 07:13

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General

Target

23ee744fa24aaada6ab0a81166c2f5466d29d502.exe
Size

477KB
MD5

447f1d5a645314beb0b1d6b0f2f5119f
SHA1

23ee744fa24aaada6ab0a81166c2f5466d29d502
SHA256

850f818aca36188fff35a492275cd63ba81f6e48263faa669fb5e192165f2f92
SHA512

2a4ed5f9a933ef0330c81672c17623143ee0c3693d6c56c85632c0bac2b7a8fb049bae0af904a1bd2a16db8ac338d78d0928e0edc7f5d866170d25c19407e752
SSDEEP

3072:N36LY3qIwBzFyIR+DSbhsR2OsHas+8yqB1LuiCx8V8rIiJzQvstptE8z0N:N36hWsHtlLv8EiFES0

Score

10^/10

purecrypter downloader loader persistence

Malware Config

Signatures

Detect PureCrypter injector 1 IoCs

loader

resource	yara_rule
behavioral1/memory/856-56-0x00000000062E0000-0x0000000006544000-memory.dmp	family_purecrypter

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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\Sfrdma = "\"C:\\Users\\Admin\\AppData\\Roaming\\Cffvs\\Sfrdma.exe\""	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
7	api.ipify.org
8	api.ipify.org

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 856 set thread context of 1408	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	36

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Gathers network information 2 TTPs 2 IoCs

Uses commandline utility to view network configuration.

System Information Discovery

T1082

Command-Line Interface

T1059

pid	Process
1816	ipconfig.exe
1020	ipconfig.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1808	powershell.exe
856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe
Token: SeDebugPrivilege	1808	powershell.exe
Token: SeDebugPrivilege	1408	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 856 wrote to memory of 968	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	26
PID 856 wrote to memory of 968	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	26
PID 856 wrote to memory of 968	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	26
PID 856 wrote to memory of 968	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	26
PID 968 wrote to memory of 1816	968	cmd.exe	28
PID 968 wrote to memory of 1816	968	cmd.exe	28
PID 968 wrote to memory of 1816	968	cmd.exe	28
PID 968 wrote to memory of 1816	968	cmd.exe	28
PID 856 wrote to memory of 1808	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	29
PID 856 wrote to memory of 1808	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	29
PID 856 wrote to memory of 1808	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	29
PID 856 wrote to memory of 1808	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	29
PID 856 wrote to memory of 1756	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	32
PID 856 wrote to memory of 1756	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	32
PID 856 wrote to memory of 1756	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	32
PID 856 wrote to memory of 1756	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	32
PID 1756 wrote to memory of 1020	1756	cmd.exe	34
PID 1756 wrote to memory of 1020	1756	cmd.exe	34
PID 1756 wrote to memory of 1020	1756	cmd.exe	34
PID 1756 wrote to memory of 1020	1756	cmd.exe	34
PID 856 wrote to memory of 1556	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	35
PID 856 wrote to memory of 1556	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	35
PID 856 wrote to memory of 1556	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	35
PID 856 wrote to memory of 1556	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	35
PID 856 wrote to memory of 1408	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	36
PID 856 wrote to memory of 1408	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	36
PID 856 wrote to memory of 1408	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	36
PID 856 wrote to memory of 1408	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	36
PID 856 wrote to memory of 1408	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	36
PID 856 wrote to memory of 1408	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	36
PID 856 wrote to memory of 1408	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	36
PID 856 wrote to memory of 1408	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	36
PID 856 wrote to memory of 1408	856	23ee744fa24aaada6ab0a81166c2f5466d29d502.exe	36

C:\Users\Admin\AppData\Local\Temp\23ee744fa24aaada6ab0a81166c2f5466d29d502.exe
"C:\Users\Admin\AppData\Local\Temp\23ee744fa24aaada6ab0a81166c2f5466d29d502.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:856
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c ipconfig/release
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:968
- - C:\Windows\SysWOW64\ipconfig.exe
    ipconfig /release
    3⤵
    - Gathers network information
    PID:1816
- 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:1808
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c ipconfig/renew
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1756
- - C:\Windows\SysWOW64\ipconfig.exe
    ipconfig /renew
    3⤵
    - Gathers network information
    PID:1020
- C:\Users\Admin\AppData\Local\Temp\23ee744fa24aaada6ab0a81166c2f5466d29d502.exe
  C:\Users\Admin\AppData\Local\Temp\23ee744fa24aaada6ab0a81166c2f5466d29d502.exe
  2⤵
  PID:1556
- C:\Users\Admin\AppData\Local\Temp\23ee744fa24aaada6ab0a81166c2f5466d29d502.exe
  C:\Users\Admin\AppData\Local\Temp\23ee744fa24aaada6ab0a81166c2f5466d29d502.exe
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1408

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Command-Line Interface

T1059

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

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/856-55-0x0000000076151000-0x0000000076153000-memory.dmp

Filesize
8KB

Download
memory/856-56-0x00000000062E0000-0x0000000006544000-memory.dmp

Filesize
2.4MB

Download
memory/856-54-0x00000000000E0000-0x000000000015C000-memory.dmp

Filesize
496KB

Download
memory/856-68-0x0000000005070000-0x00000000050C4000-memory.dmp

Filesize
336KB

Download
memory/1408-73-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1408-74-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1408-79-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1408-77-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1408-72-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1408-69-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1408-70-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1808-63-0x000000006F410000-0x000000006F9BB000-memory.dmp

Filesize
5.7MB

Download
memory/1808-62-0x000000006F410000-0x000000006F9BB000-memory.dmp

Filesize
5.7MB

Download
memory/1808-64-0x000000006F410000-0x000000006F9BB000-memory.dmp

Filesize
5.7MB

Download