purecrypter | c1c2c7f68cd6257da48226477b7be1b3d82b9f6ee7b1e421b7b9d5191f89c8c6

General

Target

tmp.exe
Size

159KB
MD5

2c8ecd01029e296bf5c6b743e07bcc8d
SHA1

98534bd6d5c08cf14734a63713d930e12f69c5f0
SHA256

c1c2c7f68cd6257da48226477b7be1b3d82b9f6ee7b1e421b7b9d5191f89c8c6
SHA512

983590ed6f4aacd9f80142b60f4f64627a2f639ccda9c32b3c6260caad10f0fd667cd0c5cc93dc26ace5c5c6b1a84b4e8a27623bba873bf15f81537e64889726
SSDEEP

768:CM9Cr+M0fV7RW1JbUGmp7NxryR27zAFEzD/xworhF:CM92e7RAJu7vryR2XSWwOhF

Score

10^/10

purecrypter snakekeylogger collection downloader keylogger loader stealer

Malware Config

Extracted

Family

purecrypter

C2

http://192.3.26.135/uo/Ksagb.png

Extracted

Family

snakekeylogger

Credentials

Protocol: smtp
Host:
us2.smtp.mailhostbox.com
Port:
587
Username:
[email protected]
Password:
doDHyw%0
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/1788-69-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/1788-70-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/1788-72-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/1788-74-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/1788-76-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/1788-77-0x0000000004BF0000-0x0000000004C30000-memory.dmp	family_snakekeylogger
behavioral1/memory/1788-78-0x0000000004BF0000-0x0000000004C30000-memory.dmp	family_snakekeylogger

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe
Key opened	\REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe
Key opened	\REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\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 1408 set thread context of 1788	1408	tmp.exe	30

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 2 IoCs

pid	Process
1652	powershell.exe
1788	MSBuild.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1408	tmp.exe
Token: SeDebugPrivilege	1652	powershell.exe
Token: SeDebugPrivilege	1788	MSBuild.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 1408 wrote to memory of 1652	1408	tmp.exe	28
PID 1408 wrote to memory of 1652	1408	tmp.exe	28
PID 1408 wrote to memory of 1652	1408	tmp.exe	28
PID 1408 wrote to memory of 1652	1408	tmp.exe	28
PID 1408 wrote to memory of 1788	1408	tmp.exe	30
PID 1408 wrote to memory of 1788	1408	tmp.exe	30
PID 1408 wrote to memory of 1788	1408	tmp.exe	30
PID 1408 wrote to memory of 1788	1408	tmp.exe	30
PID 1408 wrote to memory of 1788	1408	tmp.exe	30
PID 1408 wrote to memory of 1788	1408	tmp.exe	30
PID 1408 wrote to memory of 1788	1408	tmp.exe	30
PID 1408 wrote to memory of 1788	1408	tmp.exe	30
PID 1408 wrote to memory of 1788	1408	tmp.exe	30

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3430344531-3702557399-3004411149-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1408
- 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:1652
- 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:1788

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

Replay Monitor

Loading Replay Monitor...

Downloads

memory/1408-54-0x0000000001220000-0x000000000124E000-memory.dmp

Filesize
184KB

Download
memory/1408-55-0x0000000000A10000-0x0000000000A50000-memory.dmp

Filesize
256KB

Download
memory/1408-56-0x00000000065E0000-0x000000000671A000-memory.dmp

Filesize
1.2MB

Download
memory/1408-57-0x0000000004D80000-0x0000000004E12000-memory.dmp

Filesize
584KB

Download
memory/1408-62-0x0000000000A10000-0x0000000000A50000-memory.dmp

Filesize
256KB

Download
memory/1652-60-0x0000000001D60000-0x0000000001DA0000-memory.dmp

Filesize
256KB

Download
memory/1652-61-0x0000000001D60000-0x0000000001DA0000-memory.dmp

Filesize
256KB

Download
memory/1652-63-0x0000000001D60000-0x0000000001DA0000-memory.dmp

Filesize
256KB

Download
memory/1652-64-0x0000000001D60000-0x0000000001DA0000-memory.dmp

Filesize
256KB

Download
memory/1652-65-0x0000000001D60000-0x0000000001DA0000-memory.dmp

Filesize
256KB

Download
memory/1788-67-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1788-68-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1788-69-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1788-70-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1788-71-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

Filesize
4KB

Download
memory/1788-72-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1788-74-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1788-76-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1788-77-0x0000000004BF0000-0x0000000004C30000-memory.dmp

Filesize
256KB

Download
memory/1788-78-0x0000000004BF0000-0x0000000004C30000-memory.dmp

Filesize
256KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads