purecrypter | f62a125f352829465fa47169796d506a7a26766b1ae2f2a3b55df58970996bda

General

Target

Ojqremwj.exe
Size

7KB
MD5

5af3b9cee4ef5f2b9210486ea52f4b93
SHA1

90d93618f9b603bc160b09e58f778790e8ca9ce1
SHA256

f62a125f352829465fa47169796d506a7a26766b1ae2f2a3b55df58970996bda
SHA512

894d560b791919c4e22fa8e8acf26d06b6ff9dc628b964cb2a706b2205465f22e71b1f3ce99cacb9f19cd0738bbf544bd7fae26c3abe14c1df4780e2dc3df96e
SSDEEP

96:H/ipKgeeUOyVZfmVLhjtU3R9070IDkPOtuZizNt:V8anCLhjtSE/YPOKE

Score

10^/10

purecrypter snakekeylogger collection downloader keylogger loader persistence stealer

Malware Config

Extracted

Family

snakekeylogger

C2

https://api.telegram.org/bot5824924248:AAF4WKjJ8FxpNsC2HwCM114EP_g8rFkC4wQ/sendMessage?chat_id=2054148913

Signatures

Detect PureCrypter injector 1 IoCs

loader

Processes:

resource	yara_rule
behavioral1/memory/1532-56-0x0000000004FC0000-0x000000000502E000-memory.dmp	family_purecrypter

PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
loader downloader purecrypter
Snake Keylogger
Keylogger and Infostealer first seen in November 2020.
stealer keylogger snakekeylogger

Snake Keylogger payload 6 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1560-66-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/1560-68-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/1560-69-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/1560-70-0x00000000004206FE-mapping.dmp	family_snakekeylogger
behavioral1/memory/1560-72-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/1560-74-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

Processes:

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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

Ojqremwj.exe

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

9 checkip.dyndns.org
Suspicious use of SetThreadContext 1 IoCs

Processes:

Ojqremwj.exe

description pid process target process

PID 1532 set thread context of 1560 1532 Ojqremwj.exe MSBuild.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 5 IoCs

Processes:

powershell.exeOjqremwj.exeMSBuild.exe

pid process

1184 powershell.exe
1532 Ojqremwj.exe
1532 Ojqremwj.exe
1560 MSBuild.exe
1560 MSBuild.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

Ojqremwj.exepowershell.exeMSBuild.exe

description pid process

Token: SeDebugPrivilege 1532 Ojqremwj.exe
Token: SeDebugPrivilege 1184 powershell.exe
Token: SeDebugPrivilege 1560 MSBuild.exe

flow	ioc
9	checkip.dyndns.org

description	pid	process	target process
PID 1532 set thread context of 1560	1532	Ojqremwj.exe	MSBuild.exe

pid	process
1184	powershell.exe
1532	Ojqremwj.exe
1532	Ojqremwj.exe
1560	MSBuild.exe
1560	MSBuild.exe

description	pid	process
Token: SeDebugPrivilege	1532	Ojqremwj.exe
Token: SeDebugPrivilege	1184	powershell.exe
Token: SeDebugPrivilege	1560	MSBuild.exe

Suspicious use of WriteProcessMemory 17 IoCs

Processes:

Ojqremwj.exe

description	pid	process	target process
PID 1532 wrote to memory of 1184	1532	Ojqremwj.exe	powershell.exe
PID 1532 wrote to memory of 1184	1532	Ojqremwj.exe	powershell.exe
PID 1532 wrote to memory of 1184	1532	Ojqremwj.exe	powershell.exe
PID 1532 wrote to memory of 1184	1532	Ojqremwj.exe	powershell.exe
PID 1532 wrote to memory of 924	1532	Ojqremwj.exe	MSBuild.exe
PID 1532 wrote to memory of 924	1532	Ojqremwj.exe	MSBuild.exe
PID 1532 wrote to memory of 924	1532	Ojqremwj.exe	MSBuild.exe
PID 1532 wrote to memory of 924	1532	Ojqremwj.exe	MSBuild.exe
PID 1532 wrote to memory of 1560	1532	Ojqremwj.exe	MSBuild.exe
PID 1532 wrote to memory of 1560	1532	Ojqremwj.exe	MSBuild.exe
PID 1532 wrote to memory of 1560	1532	Ojqremwj.exe	MSBuild.exe
PID 1532 wrote to memory of 1560	1532	Ojqremwj.exe	MSBuild.exe
PID 1532 wrote to memory of 1560	1532	Ojqremwj.exe	MSBuild.exe
PID 1532 wrote to memory of 1560	1532	Ojqremwj.exe	MSBuild.exe
PID 1532 wrote to memory of 1560	1532	Ojqremwj.exe	MSBuild.exe
PID 1532 wrote to memory of 1560	1532	Ojqremwj.exe	MSBuild.exe
PID 1532 wrote to memory of 1560	1532	Ojqremwj.exe	MSBuild.exe

outlook_office_path 1 IoCs

Processes:

MSBuild.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	MSBuild.exe

outlook_win_path 1 IoCs

Processes:

MSBuild.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	MSBuild.exe

C:\Users\Admin\AppData\Local\Temp\Ojqremwj.exe
"C:\Users\Admin\AppData\Local\Temp\Ojqremwj.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1532

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:1184

C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
2⤵
PID:924

C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
2⤵
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
PID:1560

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Email Collection

1

T1114

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/1184-58-0x0000000000000000-mapping.dmp

Download
memory/1184-60-0x000000006DF40000-0x000000006E4EB000-memory.dmp

Filesize
5.7MB

Download
memory/1184-61-0x000000006DF40000-0x000000006E4EB000-memory.dmp

Filesize
5.7MB

Download
memory/1184-62-0x000000006DF40000-0x000000006E4EB000-memory.dmp

Filesize
5.7MB

Download
memory/1532-54-0x0000000000D80000-0x0000000000D88000-memory.dmp

Filesize
32KB

Download
memory/1532-55-0x0000000074DA1000-0x0000000074DA3000-memory.dmp

Filesize
8KB

Download
memory/1532-56-0x0000000004FC0000-0x000000000502E000-memory.dmp

Filesize
440KB

Download
memory/1532-57-0x00000000056D0000-0x0000000005762000-memory.dmp

Filesize
584KB

Download
memory/1560-63-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1560-64-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1560-66-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1560-68-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1560-69-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1560-70-0x00000000004206FE-mapping.dmp

Download
memory/1560-72-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1560-74-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads