purecrypter | 9cc6511bbdabccc21e3fee933fb9cc223b3e17d6865d12dae7ebaa2074f9b39f

General

Target

Gyjjmn.exe
Size

13KB
MD5

1f78bd63a9097e0d1208cbc2bbc6ea17
SHA1

e8a086e14cc775951ee4628f586fc00b03e1c14f
SHA256

9cc6511bbdabccc21e3fee933fb9cc223b3e17d6865d12dae7ebaa2074f9b39f
SHA512

3e9f57ead229d78d5c1b5d5e045711cf367fc3a750f3c6f8f41d405de49e0b2f0f03b9a834c76e58a25c5f9372683b86e1c1c705f3cabc15a4102e43f2cf2740
SSDEEP

192:novfGLcL843eeLor7jAU8v5k+gXDVSTL5RtLe/Y2wdME:ovfGLcLNdLor7jgk+gXDw1Letu

Score

10^/10

purecrypter snakekeylogger collection downloader keylogger loader stealer

Malware Config

Extracted

Family

purecrypter

C2

https://cdn.discordapp.com/attachments/1113589887258607668/1113593768474574978/Kptmybrzjx.dat

Extracted

Family

snakekeylogger

C2

https://api.telegram.org/bot5996089921:AAFFEnbgTY8Gt8G5jJy6llKhDg_Ha193t7c/sendMessage?chat_id=2054148913

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

Processes:

resource	yara_rule
behavioral2/memory/648-155-0x0000000140000000-0x0000000140024000-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

Processes:

Gyjjmn.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Control Panel\International\Geo\Nation Gyjjmn.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Control Panel\International\Geo\Nation	Gyjjmn.exe

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

Processes:

MSBuild.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe
Key opened	\REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe
Key opened	\REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\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.

Processes:

flow ioc

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

Processes:

Gyjjmn.exe

description pid process target process

PID 4948 set thread context of 648 4948 Gyjjmn.exe MSBuild.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

powershell.exeMSBuild.exe

pid process

1508 powershell.exe
1508 powershell.exe
648 MSBuild.exe
648 MSBuild.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

Gyjjmn.exepowershell.exeMSBuild.exe

description pid process

Token: SeDebugPrivilege 4948 Gyjjmn.exe
Token: SeDebugPrivilege 1508 powershell.exe
Token: SeDebugPrivilege 648 MSBuild.exe

flow	ioc
32	checkip.dyndns.org

description	pid	process	target process
PID 4948 set thread context of 648	4948	Gyjjmn.exe	MSBuild.exe

pid	process
1508	powershell.exe
1508	powershell.exe
648	MSBuild.exe
648	MSBuild.exe

description	pid	process
Token: SeDebugPrivilege	4948	Gyjjmn.exe
Token: SeDebugPrivilege	1508	powershell.exe
Token: SeDebugPrivilege	648	MSBuild.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

Gyjjmn.exe

description	pid	process	target process
PID 4948 wrote to memory of 1508	4948	Gyjjmn.exe	powershell.exe
PID 4948 wrote to memory of 1508	4948	Gyjjmn.exe	powershell.exe
PID 4948 wrote to memory of 648	4948	Gyjjmn.exe	MSBuild.exe
PID 4948 wrote to memory of 648	4948	Gyjjmn.exe	MSBuild.exe
PID 4948 wrote to memory of 648	4948	Gyjjmn.exe	MSBuild.exe
PID 4948 wrote to memory of 648	4948	Gyjjmn.exe	MSBuild.exe
PID 4948 wrote to memory of 648	4948	Gyjjmn.exe	MSBuild.exe
PID 4948 wrote to memory of 648	4948	Gyjjmn.exe	MSBuild.exe

outlook_office_path 1 IoCs

Processes:

MSBuild.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-4238149048-355649189-894321705-1000\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-1-5-21-4238149048-355649189-894321705-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe

C:\Users\Admin\AppData\Local\Temp\Gyjjmn.exe
"C:\Users\Admin\AppData\Local\Temp\Gyjjmn.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4948

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1508

C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
2⤵
- Accesses Microsoft Outlook profiles
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- outlook_office_path
- outlook_win_path
PID:648

Network

MITRE ATT&CK Matrix ATT&CK 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

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_nug4qhce.1ge.ps1
Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/648-155-0x0000000140000000-0x0000000140024000-memory.dmp

Filesize
144KB

Download
memory/648-159-0x0000025654750000-0x0000025654760000-memory.dmp

Filesize
64KB

Download
memory/648-158-0x0000025654930000-0x0000025654AF2000-memory.dmp

Filesize
1.8MB

Download
memory/648-157-0x0000025654750000-0x0000025654760000-memory.dmp

Filesize
64KB

Download
memory/1508-147-0x000001A5A1340000-0x000001A5A1350000-memory.dmp

Filesize
64KB

Download
memory/1508-149-0x000001A5A1340000-0x000001A5A1350000-memory.dmp

Filesize
64KB

Download
memory/1508-150-0x000001A5A1340000-0x000001A5A1350000-memory.dmp

Filesize
64KB

Download
memory/1508-151-0x000001A5A1340000-0x000001A5A1350000-memory.dmp

Filesize
64KB

Download
memory/1508-146-0x000001A5A1340000-0x000001A5A1350000-memory.dmp

Filesize
64KB

Download
memory/1508-145-0x000001A5A1340000-0x000001A5A1350000-memory.dmp

Filesize
64KB

Download
memory/4948-133-0x00000000007B0000-0x00000000007B8000-memory.dmp

Filesize
32KB

Download
memory/4948-148-0x000000001B3D0000-0x000000001B3E0000-memory.dmp

Filesize
64KB

Download
memory/4948-135-0x000000001B3E0000-0x000000001B402000-memory.dmp

Filesize
136KB

Download
memory/4948-134-0x000000001B3D0000-0x000000001B3E0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads