purecrypter | 17e813ed934ac345e4b9b9384aaff9e5b7a20b4efc8f75ef784f06bde2420b2d

General

Target

Yoelcvrbdj.exe
Size

19KB
MD5

e0848154f754c0cb4d9fce30e73d258c
SHA1

d854344383ac3fb8a6c81653df97dfb6ba47d7e0
SHA256

17e813ed934ac345e4b9b9384aaff9e5b7a20b4efc8f75ef784f06bde2420b2d
SHA512

4a9ea4ac5bf64494f0afdfe636397edfdb425329647aef7e8cc757e1794b350d90d7a10e839f52687364e605fcc7095d91890aa1d99cd1fe3820ac9e5946581e
SSDEEP

384:Fzf4L7L/YLpr71JdWUyLJiCI5HNPNZJ9afejI:G//M3iJ/Ij8

Score

10^/10

purecrypter snakekeylogger collection downloader keylogger loader stealer

Malware Config

Extracted

Family

purecrypter

C2

https://cdn.discordapp.com/attachments/1113754118750752801/1113762519178285166/Khdovdpst.bmp

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/1976-155-0x0000000140000000-0x0000000140024000-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:

Yoelcvrbdj.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2275444769-3691835758-4097679484-1000\Control Panel\International\Geo\Nation	Yoelcvrbdj.exe

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

Processes:

MSBuild.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-2275444769-3691835758-4097679484-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe
Key opened	\REGISTRY\USER\S-1-5-21-2275444769-3691835758-4097679484-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe
Key opened	\REGISTRY\USER\S-1-5-21-2275444769-3691835758-4097679484-1000\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.

Processes:

flow ioc

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

Processes:

Yoelcvrbdj.exe

description pid process target process

PID 1980 set thread context of 1976 1980 Yoelcvrbdj.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

2080 powershell.exe
2080 powershell.exe
1976 MSBuild.exe
1976 MSBuild.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

Yoelcvrbdj.exepowershell.exeMSBuild.exe

description pid process

Token: SeDebugPrivilege 1980 Yoelcvrbdj.exe
Token: SeDebugPrivilege 2080 powershell.exe
Token: SeDebugPrivilege 1976 MSBuild.exe

flow	ioc
36	checkip.dyndns.org

description	pid	process	target process
PID 1980 set thread context of 1976	1980	Yoelcvrbdj.exe	MSBuild.exe

pid	process
2080	powershell.exe
2080	powershell.exe
1976	MSBuild.exe
1976	MSBuild.exe

description	pid	process
Token: SeDebugPrivilege	1980	Yoelcvrbdj.exe
Token: SeDebugPrivilege	2080	powershell.exe
Token: SeDebugPrivilege	1976	MSBuild.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

Yoelcvrbdj.exe

description	pid	process	target process
PID 1980 wrote to memory of 2080	1980	Yoelcvrbdj.exe	powershell.exe
PID 1980 wrote to memory of 2080	1980	Yoelcvrbdj.exe	powershell.exe
PID 1980 wrote to memory of 1976	1980	Yoelcvrbdj.exe	MSBuild.exe
PID 1980 wrote to memory of 1976	1980	Yoelcvrbdj.exe	MSBuild.exe
PID 1980 wrote to memory of 1976	1980	Yoelcvrbdj.exe	MSBuild.exe
PID 1980 wrote to memory of 1976	1980	Yoelcvrbdj.exe	MSBuild.exe
PID 1980 wrote to memory of 1976	1980	Yoelcvrbdj.exe	MSBuild.exe
PID 1980 wrote to memory of 1976	1980	Yoelcvrbdj.exe	MSBuild.exe

outlook_office_path 1 IoCs

Processes:

MSBuild.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-2275444769-3691835758-4097679484-1000\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-1-5-21-2275444769-3691835758-4097679484-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe

C:\Users\Admin\AppData\Local\Temp\Yoelcvrbdj.exe
"C:\Users\Admin\AppData\Local\Temp\Yoelcvrbdj.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1980

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:2080

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:1976

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

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_zmy44tp4.i4r.ps1
Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1976-155-0x0000000140000000-0x0000000140024000-memory.dmp

Filesize
144KB

Download
memory/1976-159-0x0000026A3DEE0000-0x0000026A3DEF0000-memory.dmp

Filesize
64KB

Download
memory/1976-158-0x0000026A584B0000-0x0000026A58672000-memory.dmp

Filesize
1.8MB

Download
memory/1976-157-0x0000026A3DEE0000-0x0000026A3DEF0000-memory.dmp

Filesize
64KB

Download
memory/1980-134-0x000000001AFD0000-0x000000001AFE0000-memory.dmp

Filesize
64KB

Download
memory/1980-135-0x000000001AFD0000-0x000000001AFE0000-memory.dmp

Filesize
64KB

Download
memory/1980-136-0x000000001AF90000-0x000000001AFB2000-memory.dmp

Filesize
136KB

Download
memory/1980-133-0x0000000000320000-0x000000000032A000-memory.dmp

Filesize
40KB

Download
memory/2080-147-0x000001B391520000-0x000001B391530000-memory.dmp

Filesize
64KB

Download
memory/2080-151-0x000001B391520000-0x000001B391530000-memory.dmp

Filesize
64KB

Download
memory/2080-150-0x000001B391520000-0x000001B391530000-memory.dmp

Filesize
64KB

Download
memory/2080-149-0x000001B391520000-0x000001B391530000-memory.dmp

Filesize
64KB

Download
memory/2080-148-0x000001B391520000-0x000001B391530000-memory.dmp

Filesize
64KB

Download
memory/2080-146-0x000001B391520000-0x000001B391530000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads