purecrypter | 850f818aca36188fff35a492275cd63ba81f6e48263faa669fb5e192165f2f92

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

Processes:

resource	yara_rule
behavioral1/memory/1108-56-0x0000000006290000-0x00000000064F4000-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

Processes:

Doc20230126.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Doc20230126.exe
Key opened	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Doc20230126.exe
Key opened	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\Software\Microsoft\Office\16.0\Outlook\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

Processes:

Doc20230126.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\Software\Microsoft\Windows\CurrentVersion\Run\Sfrdma = "\"C:\\Users\\Admin\\AppData\\Roaming\\Cffvs\\Sfrdma.exe\""	Doc20230126.exe

Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

6 api.ipify.org
Suspicious use of SetThreadContext 1 IoCs

Processes:

Doc20230126.exe

description pid process target process

PID 1108 set thread context of 1932 1108 Doc20230126.exe Doc20230126.exe
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

Processes:

ipconfig.exeipconfig.exe

pid process

584 ipconfig.exe
1260 ipconfig.exe
Suspicious behavior: EnumeratesProcesses 7 IoCs

Processes:

powershell.exeDoc20230126.exe

pid process

592 powershell.exe
1108 Doc20230126.exe
1108 Doc20230126.exe
1108 Doc20230126.exe
1108 Doc20230126.exe
1108 Doc20230126.exe
1108 Doc20230126.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

Doc20230126.exepowershell.exeDoc20230126.exe

description pid process

Token: SeDebugPrivilege 1108 Doc20230126.exe
Token: SeDebugPrivilege 592 powershell.exe
Token: SeDebugPrivilege 1932 Doc20230126.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Doc20230126.exe

pid process

1932 Doc20230126.exe

flow	ioc
6	api.ipify.org

description	pid	process	target process
PID 1108 set thread context of 1932	1108	Doc20230126.exe	Doc20230126.exe

pid	process
584	ipconfig.exe
1260	ipconfig.exe

pid	process
592	powershell.exe
1108	Doc20230126.exe
1108	Doc20230126.exe
1108	Doc20230126.exe
1108	Doc20230126.exe
1108	Doc20230126.exe
1108	Doc20230126.exe

description	pid	process
Token: SeDebugPrivilege	1108	Doc20230126.exe
Token: SeDebugPrivilege	592	powershell.exe
Token: SeDebugPrivilege	1932	Doc20230126.exe

pid	process
1932	Doc20230126.exe

Suspicious use of WriteProcessMemory 41 IoCs

Processes:

Doc20230126.execmd.execmd.exe

description	pid	process	target process
PID 1108 wrote to memory of 676	1108	Doc20230126.exe	cmd.exe
PID 1108 wrote to memory of 676	1108	Doc20230126.exe	cmd.exe
PID 1108 wrote to memory of 676	1108	Doc20230126.exe	cmd.exe
PID 1108 wrote to memory of 676	1108	Doc20230126.exe	cmd.exe
PID 676 wrote to memory of 584	676	cmd.exe	ipconfig.exe
PID 676 wrote to memory of 584	676	cmd.exe	ipconfig.exe
PID 676 wrote to memory of 584	676	cmd.exe	ipconfig.exe
PID 676 wrote to memory of 584	676	cmd.exe	ipconfig.exe
PID 1108 wrote to memory of 592	1108	Doc20230126.exe	powershell.exe
PID 1108 wrote to memory of 592	1108	Doc20230126.exe	powershell.exe
PID 1108 wrote to memory of 592	1108	Doc20230126.exe	powershell.exe
PID 1108 wrote to memory of 592	1108	Doc20230126.exe	powershell.exe
PID 1108 wrote to memory of 1072	1108	Doc20230126.exe	cmd.exe
PID 1108 wrote to memory of 1072	1108	Doc20230126.exe	cmd.exe
PID 1108 wrote to memory of 1072	1108	Doc20230126.exe	cmd.exe
PID 1108 wrote to memory of 1072	1108	Doc20230126.exe	cmd.exe
PID 1072 wrote to memory of 1260	1072	cmd.exe	ipconfig.exe
PID 1072 wrote to memory of 1260	1072	cmd.exe	ipconfig.exe
PID 1072 wrote to memory of 1260	1072	cmd.exe	ipconfig.exe
PID 1072 wrote to memory of 1260	1072	cmd.exe	ipconfig.exe
PID 1108 wrote to memory of 1492	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1492	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1492	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1492	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1396	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1396	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1396	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1396	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1668	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1668	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1668	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1668	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1932	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1932	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1932	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1932	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1932	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1932	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1932	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1932	1108	Doc20230126.exe	Doc20230126.exe
PID 1108 wrote to memory of 1932	1108	Doc20230126.exe	Doc20230126.exe

outlook_office_path 1 IoCs

Processes:

Doc20230126.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	Doc20230126.exe

outlook_win_path 1 IoCs

Processes:

Doc20230126.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\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:1108

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c ipconfig/release
2⤵
- Suspicious use of WriteProcessMemory
PID:676

C:\Windows\SysWOW64\ipconfig.exe
ipconfig /release
3⤵
- Gathers network information
PID:584

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:592

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c ipconfig/renew
2⤵
- Suspicious use of WriteProcessMemory
PID:1072

C:\Windows\SysWOW64\ipconfig.exe
ipconfig /renew
3⤵
- Gathers network information
PID:1260

C:\Users\Admin\AppData\Local\Temp\Doc20230126.exe
C:\Users\Admin\AppData\Local\Temp\Doc20230126.exe
2⤵
PID:1492

C:\Users\Admin\AppData\Local\Temp\Doc20230126.exe
C:\Users\Admin\AppData\Local\Temp\Doc20230126.exe
2⤵
PID:1396

C:\Users\Admin\AppData\Local\Temp\Doc20230126.exe
C:\Users\Admin\AppData\Local\Temp\Doc20230126.exe
2⤵
PID:1668

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:1932

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Command-Line Interface

1

T1059

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Credentials in Files

3

T1081

Discovery

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

3

T1005

Email Collection

1

T1114

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/584-58-0x0000000000000000-mapping.dmp

Download
memory/592-60-0x0000000000000000-mapping.dmp

Download
memory/592-62-0x000000006F8D0000-0x000000006FE7B000-memory.dmp

Filesize
5.7MB

Download
memory/592-63-0x000000006F8D0000-0x000000006FE7B000-memory.dmp

Filesize
5.7MB

Download
memory/592-64-0x000000006F8D0000-0x000000006FE7B000-memory.dmp

Filesize
5.7MB

Download
memory/676-57-0x0000000000000000-mapping.dmp

Download
memory/1072-65-0x0000000000000000-mapping.dmp

Download
memory/1108-68-0x0000000005080000-0x00000000050D4000-memory.dmp

Filesize
336KB

Download
memory/1108-55-0x00000000767F1000-0x00000000767F3000-memory.dmp

Filesize
8KB

Download
memory/1108-56-0x0000000006290000-0x00000000064F4000-memory.dmp

Filesize
2.4MB

Download
memory/1108-54-0x0000000000140000-0x00000000001BC000-memory.dmp

Filesize
496KB

Download
memory/1260-66-0x0000000000000000-mapping.dmp

Download
memory/1932-69-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1932-70-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1932-72-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1932-73-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1932-74-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1932-75-0x000000000042ADCE-mapping.dmp

Download
memory/1932-77-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/1932-79-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

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Downloads