purecrypter | 464bf35525b6f482b91e5a1ba287c58304e7c41558c8070e42bdaa19769b5b05

General

Target

SMGS.exe
Size

4.8MB
MD5

973d6bb15efd90c87c861bb50682b4e0
SHA1

6be806023c19d7b332118bdc60ec2cabf4afd7a7
SHA256

464bf35525b6f482b91e5a1ba287c58304e7c41558c8070e42bdaa19769b5b05
SHA512

02355d9053c02c7470cdf6bde0a7d30ddf8a15a98c70dedf67a44639db3f92f1f961cb887e262b91eaeaeeef406e83c1294c690165afe2d7b50bae2e13896237
SSDEEP

24576:VBgHFLM9d5M7WbzMdMp+5R6hIONsEQ/xWxPNnb1T/d+BIPFsKmQhhEG6veOSV1jF:

Score

10^/10

purecrypter snakekeylogger collection downloader keylogger loader persistence spyware stealer

Malware Config

Extracted

Family

snakekeylogger

Credentials

Protocol: smtp
Host:
mail.jtinti.com
Port:
587
Username:
[email protected]
Password:
Rockfishbay12#
Email To:
[email protected]

Signatures

Detect PureCrypter injector 1 IoCs

loader

resource	yara_rule
behavioral1/memory/848-55-0x0000000006160000-0x00000000063C6000-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

resource	yara_rule
behavioral1/memory/892-65-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/892-67-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/892-68-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/892-69-0x000000000042073E-mapping.dmp	family_snakekeylogger
behavioral1/memory/892-71-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger
behavioral1/memory/892-73-0x0000000000400000-0x0000000000426000-memory.dmp	family_snakekeylogger

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

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	SMGS.exe
Key opened	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	SMGS.exe
Key opened	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	SMGS.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\Zzycvoloo = "\"C:\\Users\\Admin\\AppData\\Roaming\\Nqtsofal\\Zzycvoloo.exe\""	SMGS.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
3	checkip.dyndns.org

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 848 set thread context of 892	848	SMGS.exe	29

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 3 IoCs

pid	Process
272	powershell.exe
892	SMGS.exe
892	SMGS.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	848	SMGS.exe
Token: SeDebugPrivilege	272	powershell.exe
Token: SeDebugPrivilege	892	SMGS.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 848 wrote to memory of 272	848	SMGS.exe	27
PID 848 wrote to memory of 272	848	SMGS.exe	27
PID 848 wrote to memory of 272	848	SMGS.exe	27
PID 848 wrote to memory of 272	848	SMGS.exe	27
PID 848 wrote to memory of 892	848	SMGS.exe	29
PID 848 wrote to memory of 892	848	SMGS.exe	29
PID 848 wrote to memory of 892	848	SMGS.exe	29
PID 848 wrote to memory of 892	848	SMGS.exe	29
PID 848 wrote to memory of 892	848	SMGS.exe	29
PID 848 wrote to memory of 892	848	SMGS.exe	29
PID 848 wrote to memory of 892	848	SMGS.exe	29
PID 848 wrote to memory of 892	848	SMGS.exe	29
PID 848 wrote to memory of 892	848	SMGS.exe	29

outlook_office_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	SMGS.exe

outlook_win_path 1 IoCs

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	SMGS.exe

C:\Users\Admin\AppData\Local\Temp\SMGS.exe
"C:\Users\Admin\AppData\Local\Temp\SMGS.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:848
- 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:272
- C:\Users\Admin\AppData\Local\Temp\SMGS.exe
  C:\Users\Admin\AppData\Local\Temp\SMGS.exe
  2⤵
  - Accesses Microsoft Outlook profiles
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - outlook_office_path
  - outlook_win_path
  PID:892

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

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

1

T1082

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/272-57-0x0000000075601000-0x0000000075603000-memory.dmp

Filesize
8KB

Download
memory/272-58-0x000000006F5A0000-0x000000006FB4B000-memory.dmp

Filesize
5.7MB

Download
memory/272-59-0x000000006F5A0000-0x000000006FB4B000-memory.dmp

Filesize
5.7MB

Download
memory/272-60-0x000000006F5A0000-0x000000006FB4B000-memory.dmp

Filesize
5.7MB

Download
memory/848-54-0x0000000000900000-0x0000000000DC8000-memory.dmp

Filesize
4.8MB

Download
memory/848-55-0x0000000006160000-0x00000000063C6000-memory.dmp

Filesize
2.4MB

Download
memory/848-61-0x0000000004F30000-0x0000000004F7A000-memory.dmp

Filesize
296KB

Download
memory/892-62-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/892-63-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/892-65-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/892-67-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/892-68-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/892-71-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/892-73-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download

Analysis

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