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 1 IoCs

resource	yara_rule
behavioral2/memory/632-166-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Control Panel\International\Geo\Nation	Payment Receipt.exe

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe
Key opened	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe
Key opened	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Software\Microsoft\Office\16.0\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
36	checkip.dyndns.org

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3988 set thread context of 632	3988	Payment Receipt.exe	90

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3448	powershell.exe
3448	powershell.exe
3988	Payment Receipt.exe
3988	Payment Receipt.exe
632	MSBuild.exe
632	MSBuild.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3988	Payment Receipt.exe
Token: SeDebugPrivilege	3448	powershell.exe
Token: SeDebugPrivilege	632	MSBuild.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3988 wrote to memory of 3448	3988	Payment Receipt.exe	79
PID 3988 wrote to memory of 3448	3988	Payment Receipt.exe	79
PID 3988 wrote to memory of 3448	3988	Payment Receipt.exe	79
PID 3988 wrote to memory of 3712	3988	Payment Receipt.exe	89
PID 3988 wrote to memory of 3712	3988	Payment Receipt.exe	89
PID 3988 wrote to memory of 3712	3988	Payment Receipt.exe	89
PID 3988 wrote to memory of 632	3988	Payment Receipt.exe	90
PID 3988 wrote to memory of 632	3988	Payment Receipt.exe	90
PID 3988 wrote to memory of 632	3988	Payment Receipt.exe	90
PID 3988 wrote to memory of 632	3988	Payment Receipt.exe	90
PID 3988 wrote to memory of 632	3988	Payment Receipt.exe	90
PID 3988 wrote to memory of 632	3988	Payment Receipt.exe	90
PID 3988 wrote to memory of 632	3988	Payment Receipt.exe	90
PID 3988 wrote to memory of 632	3988	Payment Receipt.exe	90

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\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⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3988
- 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:3448
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  2⤵
  PID:3712
- 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:632

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_bvunrlts.vth.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/632-171-0x00000000055D0000-0x00000000055E0000-memory.dmp

Filesize
64KB

Download
memory/632-170-0x00000000062F0000-0x00000000064B2000-memory.dmp

Filesize
1.8MB

Download
memory/632-169-0x00000000055D0000-0x00000000055E0000-memory.dmp

Filesize
64KB

Download
memory/632-168-0x0000000005240000-0x00000000052DC000-memory.dmp

Filesize
624KB

Download
memory/632-166-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/3448-153-0x0000000004A20000-0x0000000004A30000-memory.dmp

Filesize
64KB

Download
memory/3448-156-0x00000000064B0000-0x00000000064CA000-memory.dmp

Filesize
104KB

Download
memory/3448-141-0x0000000005060000-0x0000000005688000-memory.dmp

Filesize
6.2MB

Download
memory/3448-139-0x0000000004980000-0x00000000049B6000-memory.dmp

Filesize
216KB

Download
memory/3448-151-0x0000000005A10000-0x0000000005A76000-memory.dmp

Filesize
408KB

Download
memory/3448-152-0x0000000005AF0000-0x0000000005B56000-memory.dmp

Filesize
408KB

Download
memory/3448-161-0x0000000004A20000-0x0000000004A30000-memory.dmp

Filesize
64KB

Download
memory/3448-154-0x0000000005FC0000-0x0000000005FDE000-memory.dmp

Filesize
120KB

Download
memory/3448-155-0x0000000007820000-0x0000000007E9A000-memory.dmp

Filesize
6.5MB

Download
memory/3448-140-0x0000000004A20000-0x0000000004A30000-memory.dmp

Filesize
64KB

Download
memory/3448-157-0x0000000004A20000-0x0000000004A30000-memory.dmp

Filesize
64KB

Download
memory/3448-160-0x0000000004A20000-0x0000000004A30000-memory.dmp

Filesize
64KB

Download
memory/3448-159-0x0000000004A20000-0x0000000004A30000-memory.dmp

Filesize
64KB

Download
memory/3988-158-0x0000000004E40000-0x0000000004E50000-memory.dmp

Filesize
64KB

Download
memory/3988-133-0x00000000004D0000-0x00000000004E2000-memory.dmp

Filesize
72KB

Download
memory/3988-138-0x0000000008CF0000-0x0000000008D12000-memory.dmp

Filesize
136KB

Download
memory/3988-137-0x0000000004E40000-0x0000000004E50000-memory.dmp

Filesize
64KB

Download
memory/3988-136-0x0000000005040000-0x000000000504A000-memory.dmp

Filesize
40KB

Download
memory/3988-135-0x0000000004EB0000-0x0000000004F42000-memory.dmp

Filesize
584KB

Download
memory/3988-134-0x00000000053C0000-0x0000000005964000-memory.dmp

Filesize
5.6MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads