purecrypter | cd4fd070dbe5909f9e14e9228bc1243c2993e6dd105e91deed3bb3ca53e1f30d

Analysis

max time kernel
49s
max time network
152s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
26/01/2023, 13:08

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General

Target

P0-3325185-dtd-26-01-2023.exe
Size

476KB
MD5

abb0f20592407cbc9c1df8d7be759d9a
SHA1

ae2354355268cd193d54b4ae3691a31ee8744116
SHA256

cd4fd070dbe5909f9e14e9228bc1243c2993e6dd105e91deed3bb3ca53e1f30d
SHA512

c8df73077136802c81067c2647707ae34cfb01604557f2a4cdba95d4b14f4f13a8cac38fef882c36d29fa4f08cd90cdaa8e90a38c85b5fa37eae38ca79c153db
SSDEEP

3072:p2yWP9LN3qIwBzFyIR+DSbisRKOsHas+8+qB1LuiCx8V8rIiJzQvstptE8z0Y:pNWP9GTsHtZLv8EiFES0

Score

10^/10

purecrypter collection downloader loader persistence spyware stealer

Malware Config

Signatures

Detect PureCrypter injector 1 IoCs

loader

resource	yara_rule
behavioral1/memory/1088-56-0x0000000006410000-0x0000000006680000-memory.dmp	family_purecrypter

PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
loader downloader purecrypter
Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	P0-3325185-dtd-26-01-2023.exe
Key opened	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	P0-3325185-dtd-26-01-2023.exe
Key opened	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	P0-3325185-dtd-26-01-2023.exe

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-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows\CurrentVersion\Run\Sfrdma = "\"C:\\Users\\Admin\\AppData\\Roaming\\Cffvs\\Sfrdma.exe\""	P0-3325185-dtd-26-01-2023.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
6	api.ipify.org

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1088 set thread context of 1484	1088	P0-3325185-dtd-26-01-2023.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
812	ipconfig.exe
1968	ipconfig.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2024	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1088	P0-3325185-dtd-26-01-2023.exe
Token: SeDebugPrivilege	2024	powershell.exe
Token: SeDebugPrivilege	1484	P0-3325185-dtd-26-01-2023.exe

Suspicious use of WriteProcessMemory 29 IoCs

description	pid	Process	procid_target
PID 1088 wrote to memory of 1916	1088	P0-3325185-dtd-26-01-2023.exe	27
PID 1088 wrote to memory of 1916	1088	P0-3325185-dtd-26-01-2023.exe	27
PID 1088 wrote to memory of 1916	1088	P0-3325185-dtd-26-01-2023.exe	27
PID 1088 wrote to memory of 1916	1088	P0-3325185-dtd-26-01-2023.exe	27
PID 1916 wrote to memory of 812	1916	cmd.exe	29
PID 1916 wrote to memory of 812	1916	cmd.exe	29
PID 1916 wrote to memory of 812	1916	cmd.exe	29
PID 1916 wrote to memory of 812	1916	cmd.exe	29
PID 1088 wrote to memory of 2024	1088	P0-3325185-dtd-26-01-2023.exe	30
PID 1088 wrote to memory of 2024	1088	P0-3325185-dtd-26-01-2023.exe	30
PID 1088 wrote to memory of 2024	1088	P0-3325185-dtd-26-01-2023.exe	30
PID 1088 wrote to memory of 2024	1088	P0-3325185-dtd-26-01-2023.exe	30
PID 1088 wrote to memory of 2004	1088	P0-3325185-dtd-26-01-2023.exe	33
PID 1088 wrote to memory of 2004	1088	P0-3325185-dtd-26-01-2023.exe	33
PID 1088 wrote to memory of 2004	1088	P0-3325185-dtd-26-01-2023.exe	33
PID 1088 wrote to memory of 2004	1088	P0-3325185-dtd-26-01-2023.exe	33
PID 2004 wrote to memory of 1968	2004	cmd.exe	35
PID 2004 wrote to memory of 1968	2004	cmd.exe	35
PID 2004 wrote to memory of 1968	2004	cmd.exe	35
PID 2004 wrote to memory of 1968	2004	cmd.exe	35
PID 1088 wrote to memory of 1484	1088	P0-3325185-dtd-26-01-2023.exe	36
PID 1088 wrote to memory of 1484	1088	P0-3325185-dtd-26-01-2023.exe	36
PID 1088 wrote to memory of 1484	1088	P0-3325185-dtd-26-01-2023.exe	36
PID 1088 wrote to memory of 1484	1088	P0-3325185-dtd-26-01-2023.exe	36
PID 1088 wrote to memory of 1484	1088	P0-3325185-dtd-26-01-2023.exe	36
PID 1088 wrote to memory of 1484	1088	P0-3325185-dtd-26-01-2023.exe	36
PID 1088 wrote to memory of 1484	1088	P0-3325185-dtd-26-01-2023.exe	36
PID 1088 wrote to memory of 1484	1088	P0-3325185-dtd-26-01-2023.exe	36
PID 1088 wrote to memory of 1484	1088	P0-3325185-dtd-26-01-2023.exe	36

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	P0-3325185-dtd-26-01-2023.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	P0-3325185-dtd-26-01-2023.exe

C:\Users\Admin\AppData\Local\Temp\P0-3325185-dtd-26-01-2023.exe
"C:\Users\Admin\AppData\Local\Temp\P0-3325185-dtd-26-01-2023.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1088
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c ipconfig/release
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1916
- - C:\Windows\SysWOW64\ipconfig.exe
    ipconfig /release
    3⤵
    - Gathers network information
    PID:812
- 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:2024
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c ipconfig/renew
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2004
- - C:\Windows\SysWOW64\ipconfig.exe
    ipconfig /renew
    3⤵
    - Gathers network information
    PID:1968
- C:\Users\Admin\AppData\Local\Temp\P0-3325185-dtd-26-01-2023.exe
  C:\Users\Admin\AppData\Local\Temp\P0-3325185-dtd-26-01-2023.exe
  2⤵
  - Accesses Microsoft Outlook profiles
  - Suspicious use of AdjustPrivilegeToken
  - outlook_office_path
  - outlook_win_path
  PID:1484

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

Credentials in Files

T1081

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

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Downloads

memory/1088-54-0x0000000000110000-0x000000000018C000-memory.dmp

Filesize
496KB

Download
memory/1088-55-0x0000000074C91000-0x0000000074C93000-memory.dmp

Filesize
8KB

Download
memory/1088-56-0x0000000006410000-0x0000000006680000-memory.dmp

Filesize
2.4MB

Download
memory/1088-68-0x00000000052A0000-0x00000000052F4000-memory.dmp

Filesize
336KB

Download
memory/1484-69-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1484-79-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1484-74-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1484-72-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1484-77-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1484-70-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1484-73-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/2024-64-0x000000006ECC0000-0x000000006F26B000-memory.dmp

Filesize
5.7MB

Download
memory/2024-63-0x000000006ECC0000-0x000000006F26B000-memory.dmp

Filesize
5.7MB

Download
memory/2024-62-0x000000006ECC0000-0x000000006F26B000-memory.dmp

Filesize
5.7MB

Download