purecrypter | ab77697c50f92371f998ef36a853fa791b188f56722c0aa64bcf39f9d9808b5a

Analysis

max time kernel
1611s
max time network
1614s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
26/01/2023, 18:26

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General

Target

Doc20230126.exe
Size

477KB
MD5

447f1d5a645314beb0b1d6b0f2f5119f
SHA1

23ee744fa24aaada6ab0a81166c2f5466d29d502
SHA256

850f818aca36188fff35a492275cd63ba81f6e48263faa669fb5e192165f2f92
SHA512

2a4ed5f9a933ef0330c81672c17623143ee0c3693d6c56c85632c0bac2b7a8fb049bae0af904a1bd2a16db8ac338d78d0928e0edc7f5d866170d25c19407e752
SSDEEP

3072:N36LY3qIwBzFyIR+DSbhsR2OsHas+8yqB1LuiCx8V8rIiJzQvstptE8z0N:N36hWsHtlLv8EiFES0

Score

10^/10

purecrypter collection downloader loader persistence spyware stealer

Malware Config

Signatures

Detect PureCrypter injector 1 IoCs

loader

resource	yara_rule
behavioral1/memory/1700-56-0x00000000063D0000-0x0000000006634000-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-1-5-21-3406023954-474543476-3319432036-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Doc20230126.exe
Key opened	\REGISTRY\USER\S-1-5-21-3406023954-474543476-3319432036-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Doc20230126.exe
Key opened	\REGISTRY\USER\S-1-5-21-3406023954-474543476-3319432036-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Doc20230126.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-1-5-21-3406023954-474543476-3319432036-1000\Software\Microsoft\Windows\CurrentVersion\Run\Sfrdma = "\"C:\\Users\\Admin\\AppData\\Roaming\\Cffvs\\Sfrdma.exe\""	Doc20230126.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
6	api.ipify.org
7	api.ipify.org

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1700 set thread context of 1484	1700	Doc20230126.exe	39

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
304	ipconfig.exe
528	ipconfig.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
996	powershell.exe
1700	Doc20230126.exe
1700	Doc20230126.exe
1700	Doc20230126.exe
1700	Doc20230126.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1700	Doc20230126.exe
Token: SeDebugPrivilege	996	powershell.exe
Token: SeDebugPrivilege	1484	Doc20230126.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1484	Doc20230126.exe

Suspicious use of WriteProcessMemory 37 IoCs

description	pid	Process	procid_target
PID 1700 wrote to memory of 524	1700	Doc20230126.exe	28
PID 1700 wrote to memory of 524	1700	Doc20230126.exe	28
PID 1700 wrote to memory of 524	1700	Doc20230126.exe	28
PID 1700 wrote to memory of 524	1700	Doc20230126.exe	28
PID 524 wrote to memory of 528	524	cmd.exe	30
PID 524 wrote to memory of 528	524	cmd.exe	30
PID 524 wrote to memory of 528	524	cmd.exe	30
PID 524 wrote to memory of 528	524	cmd.exe	30
PID 1700 wrote to memory of 996	1700	Doc20230126.exe	31
PID 1700 wrote to memory of 996	1700	Doc20230126.exe	31
PID 1700 wrote to memory of 996	1700	Doc20230126.exe	31
PID 1700 wrote to memory of 996	1700	Doc20230126.exe	31
PID 1700 wrote to memory of 1972	1700	Doc20230126.exe	34
PID 1700 wrote to memory of 1972	1700	Doc20230126.exe	34
PID 1700 wrote to memory of 1972	1700	Doc20230126.exe	34
PID 1700 wrote to memory of 1972	1700	Doc20230126.exe	34
PID 1972 wrote to memory of 304	1972	cmd.exe	36
PID 1972 wrote to memory of 304	1972	cmd.exe	36
PID 1972 wrote to memory of 304	1972	cmd.exe	36
PID 1972 wrote to memory of 304	1972	cmd.exe	36
PID 1700 wrote to memory of 1712	1700	Doc20230126.exe	37
PID 1700 wrote to memory of 1712	1700	Doc20230126.exe	37
PID 1700 wrote to memory of 1712	1700	Doc20230126.exe	37
PID 1700 wrote to memory of 1712	1700	Doc20230126.exe	37
PID 1700 wrote to memory of 812	1700	Doc20230126.exe	38
PID 1700 wrote to memory of 812	1700	Doc20230126.exe	38
PID 1700 wrote to memory of 812	1700	Doc20230126.exe	38
PID 1700 wrote to memory of 812	1700	Doc20230126.exe	38
PID 1700 wrote to memory of 1484	1700	Doc20230126.exe	39
PID 1700 wrote to memory of 1484	1700	Doc20230126.exe	39
PID 1700 wrote to memory of 1484	1700	Doc20230126.exe	39
PID 1700 wrote to memory of 1484	1700	Doc20230126.exe	39
PID 1700 wrote to memory of 1484	1700	Doc20230126.exe	39
PID 1700 wrote to memory of 1484	1700	Doc20230126.exe	39
PID 1700 wrote to memory of 1484	1700	Doc20230126.exe	39
PID 1700 wrote to memory of 1484	1700	Doc20230126.exe	39
PID 1700 wrote to memory of 1484	1700	Doc20230126.exe	39

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3406023954-474543476-3319432036-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Doc20230126.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3406023954-474543476-3319432036-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Doc20230126.exe

C:\Users\Admin\AppData\Local\Temp\Doc20230126.exe
"C:\Users\Admin\AppData\Local\Temp\Doc20230126.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1700
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c ipconfig/release
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:524
- - C:\Windows\SysWOW64\ipconfig.exe
    ipconfig /release
    3⤵
    - Gathers network information
    PID:528
- 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:996
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c ipconfig/renew
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1972
- - C:\Windows\SysWOW64\ipconfig.exe
    ipconfig /renew
    3⤵
    - Gathers network information
    PID:304
- C:\Users\Admin\AppData\Local\Temp\Doc20230126.exe
  C:\Users\Admin\AppData\Local\Temp\Doc20230126.exe
  2⤵
  PID:1712
- C:\Users\Admin\AppData\Local\Temp\Doc20230126.exe
  C:\Users\Admin\AppData\Local\Temp\Doc20230126.exe
  2⤵
  PID:812
- C:\Users\Admin\AppData\Local\Temp\Doc20230126.exe
  C:\Users\Admin\AppData\Local\Temp\Doc20230126.exe
  2⤵
  - Accesses Microsoft Outlook profiles
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - 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

Replay Monitor

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Downloads

memory/996-63-0x000000006F8B0000-0x000000006FE5B000-memory.dmp

Filesize
5.7MB

Download
memory/996-64-0x000000006F8B0000-0x000000006FE5B000-memory.dmp

Filesize
5.7MB

Download
memory/996-62-0x000000006F8B0000-0x000000006FE5B000-memory.dmp

Filesize
5.7MB

Download
memory/1484-69-0x0000000000400000-0x0000000000430000-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/1484-72-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

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

Filesize
192KB

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

Filesize
192KB

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

Filesize
192KB

Download
memory/1700-54-0x00000000000C0000-0x000000000013C000-memory.dmp

Filesize
496KB

Download
memory/1700-55-0x0000000075FF1000-0x0000000075FF3000-memory.dmp

Filesize
8KB

Download
memory/1700-68-0x0000000004E30000-0x0000000004E84000-memory.dmp

Filesize
336KB

Download
memory/1700-56-0x00000000063D0000-0x0000000006634000-memory.dmp

Filesize
2.4MB

Download