purecrypter | 455c8d5400dc3e4f7bc02ddece8852a403929535a67daca9a6b48bb7e85461d2

General

Target

Payment Receipt.exe
Size

72KB
MD5

f50c01b28f63ea3a2f9eda5d3f62cafc
SHA1

15194fbd3471810bf689da9efeb57efdd4e4f21b
SHA256

0e7012a66e5d3c6ada99f6dcf651fc8a29f31aa74083f76ee96992df0be54ffa
SHA512

98bd8ce28d997815f135b0a73af05cd45d8bdde9d7a018311d7082ee76c3adca78b62ed161fc187febed6037aa556309cfaf13b2a29b1bd65c4a759e8fd5a8f5
SSDEEP

1536:Ua3eJtxKnsYsEMINcTa7FFrj3Pxx1Px90:Ua3ez4sKNykrjfxxpxi

Score

10^/10

purecrypter snakekeylogger collection downloader keylogger loader stealer

Malware Config

Extracted

Credentials

Protocol: smtp
Host:
siamtmc.com
Port:
587
Username:
[email protected]
Password:
s0mp0ng06

Extracted

Family

purecrypter

C2

http://172.245.191.17/000/Gjvbeqdycii.png

Extracted

Family

snakekeylogger

Credentials

Protocol: smtp
Host:
siamtmc.com
Port:
587
Username:
[email protected]
Password:
s0mp0ng06
Email To:
[email protected]

Signatures

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 7 IoCs

resource	yara_rule
behavioral1/memory/1812-72-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/1812-73-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/1812-75-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/1812-77-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/1812-79-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/1812-80-0x00000000048A0000-0x00000000048E0000-memory.dmp	family_snakekeylogger
behavioral1/memory/1812-81-0x00000000048A0000-0x00000000048E0000-memory.dmp	family_snakekeylogger

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2961826002-3968192592-354541192-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe
Key opened	\REGISTRY\USER\S-1-5-21-2961826002-3968192592-354541192-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe
Key opened	\REGISTRY\USER\S-1-5-21-2961826002-3968192592-354541192-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.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.

flow	ioc
6	checkip.dyndns.org

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1432 set thread context of 1812	1432	Payment Receipt.exe	30

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
520	powershell.exe
1812	MSBuild.exe
1812	MSBuild.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1432	Payment Receipt.exe
Token: SeDebugPrivilege	520	powershell.exe
Token: SeDebugPrivilege	1812	MSBuild.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 1432 wrote to memory of 520	1432	Payment Receipt.exe	28
PID 1432 wrote to memory of 520	1432	Payment Receipt.exe	28
PID 1432 wrote to memory of 520	1432	Payment Receipt.exe	28
PID 1432 wrote to memory of 520	1432	Payment Receipt.exe	28
PID 1432 wrote to memory of 1812	1432	Payment Receipt.exe	30
PID 1432 wrote to memory of 1812	1432	Payment Receipt.exe	30
PID 1432 wrote to memory of 1812	1432	Payment Receipt.exe	30
PID 1432 wrote to memory of 1812	1432	Payment Receipt.exe	30
PID 1432 wrote to memory of 1812	1432	Payment Receipt.exe	30
PID 1432 wrote to memory of 1812	1432	Payment Receipt.exe	30
PID 1432 wrote to memory of 1812	1432	Payment Receipt.exe	30
PID 1432 wrote to memory of 1812	1432	Payment Receipt.exe	30
PID 1432 wrote to memory of 1812	1432	Payment Receipt.exe	30

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2961826002-3968192592-354541192-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2961826002-3968192592-354541192-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe

C:\Users\Admin\AppData\Local\Temp\Payment Receipt.exe
"C:\Users\Admin\AppData\Local\Temp\Payment Receipt.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1432
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMwAwAA==
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:520
- 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:1812

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

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Downloads

memory/520-65-0x0000000002620000-0x0000000002660000-memory.dmp

Filesize
256KB

Download
memory/520-62-0x0000000002620000-0x0000000002660000-memory.dmp

Filesize
256KB

Download
memory/520-67-0x0000000002620000-0x0000000002660000-memory.dmp

Filesize
256KB

Download
memory/520-66-0x0000000002620000-0x0000000002660000-memory.dmp

Filesize
256KB

Download
memory/520-63-0x0000000002620000-0x0000000002660000-memory.dmp

Filesize
256KB

Download
memory/520-61-0x0000000002620000-0x0000000002660000-memory.dmp

Filesize
256KB

Download
memory/1432-56-0x0000000008ED0000-0x0000000008FB6000-memory.dmp

Filesize
920KB

Download
memory/1432-64-0x0000000004B40000-0x0000000004B80000-memory.dmp

Filesize
256KB

Download
memory/1432-54-0x0000000001160000-0x0000000001172000-memory.dmp

Filesize
72KB

Download
memory/1432-57-0x0000000000440000-0x0000000000450000-memory.dmp

Filesize
64KB

Download
memory/1432-58-0x0000000008750000-0x00000000087E2000-memory.dmp

Filesize
584KB

Download
memory/1432-55-0x0000000004B40000-0x0000000004B80000-memory.dmp

Filesize
256KB

Download
memory/1812-71-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1812-81-0x00000000048A0000-0x00000000048E0000-memory.dmp

Filesize
256KB

Download
memory/1812-72-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1812-73-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1812-74-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

Filesize
4KB

Download
memory/1812-75-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1812-77-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1812-79-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1812-80-0x00000000048A0000-0x00000000048E0000-memory.dmp

Filesize
256KB

Download
memory/1812-70-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads