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 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1696-76-0x0000000140000000-0x0000000140024000-memory.dmp	family_snakekeylogger
behavioral1/memory/1696-78-0x0000000140000000-0x0000000140024000-memory.dmp	family_snakekeylogger

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

Processes:

MSBuild.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-3499517378-2376672570-1134980332-1000\Software\Microsoft\Office\15.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe
Key opened	\REGISTRY\USER\S-1-5-21-3499517378-2376672570-1134980332-1000\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676	MSBuild.exe
Key opened	\REGISTRY\USER\S-1-5-21-3499517378-2376672570-1134980332-1000\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

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

Processes:

Gyjjmn.exe

description pid process target process

PID 1700 set thread context of 1696 1700 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 3 IoCs

Processes:

powershell.exeMSBuild.exe

pid process

1968 powershell.exe
1696 MSBuild.exe
1696 MSBuild.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

Gyjjmn.exepowershell.exeMSBuild.exe

description pid process

Token: SeDebugPrivilege 1700 Gyjjmn.exe
Token: SeDebugPrivilege 1968 powershell.exe
Token: SeDebugPrivilege 1696 MSBuild.exe

flow	ioc
7	checkip.dyndns.org

description	pid	process	target process
PID 1700 set thread context of 1696	1700	Gyjjmn.exe	MSBuild.exe

pid	process
1968	powershell.exe
1696	MSBuild.exe
1696	MSBuild.exe

description	pid	process
Token: SeDebugPrivilege	1700	Gyjjmn.exe
Token: SeDebugPrivilege	1968	powershell.exe
Token: SeDebugPrivilege	1696	MSBuild.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

Gyjjmn.exe

description	pid	process	target process
PID 1700 wrote to memory of 1968	1700	Gyjjmn.exe	powershell.exe
PID 1700 wrote to memory of 1968	1700	Gyjjmn.exe	powershell.exe
PID 1700 wrote to memory of 1968	1700	Gyjjmn.exe	powershell.exe
PID 1700 wrote to memory of 1696	1700	Gyjjmn.exe	MSBuild.exe
PID 1700 wrote to memory of 1696	1700	Gyjjmn.exe	MSBuild.exe
PID 1700 wrote to memory of 1696	1700	Gyjjmn.exe	MSBuild.exe
PID 1700 wrote to memory of 1696	1700	Gyjjmn.exe	MSBuild.exe
PID 1700 wrote to memory of 1696	1700	Gyjjmn.exe	MSBuild.exe
PID 1700 wrote to memory of 1696	1700	Gyjjmn.exe	MSBuild.exe
PID 1700 wrote to memory of 1696	1700	Gyjjmn.exe	MSBuild.exe

outlook_office_path 1 IoCs

Processes:

MSBuild.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-3499517378-2376672570-1134980332-1000\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-1-5-21-3499517378-2376672570-1134980332-1000\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⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1700

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:1968

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:1696

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Email Collection

1

T1114

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/1696-74-0x0000000140000000-0x0000000140024000-memory.dmp

Filesize
144KB

Download
memory/1696-81-0x000000001B9A0000-0x000000001BA20000-memory.dmp

Filesize
512KB

Download
memory/1696-78-0x0000000140000000-0x0000000140024000-memory.dmp

Filesize
144KB

Download
memory/1696-77-0x000007FFFFFDF000-0x000007FFFFFE0000-memory.dmp

Filesize
4KB

Download
memory/1696-76-0x0000000140000000-0x0000000140024000-memory.dmp

Filesize
144KB

Download
memory/1696-75-0x0000000140000000-0x0000000140024000-memory.dmp

Filesize
144KB

Download
memory/1700-68-0x000000001B1C0000-0x000000001B240000-memory.dmp

Filesize
512KB

Download
memory/1700-58-0x000000001B700000-0x000000001B792000-memory.dmp

Filesize
584KB

Download
memory/1700-55-0x000000001B1C0000-0x000000001B240000-memory.dmp

Filesize
512KB

Download
memory/1700-56-0x000000001E960000-0x000000001EA54000-memory.dmp

Filesize
976KB

Download
memory/1700-54-0x00000000000E0000-0x00000000000E8000-memory.dmp

Filesize
32KB

Download
memory/1700-57-0x0000000000430000-0x0000000000440000-memory.dmp

Filesize
64KB

Download
memory/1968-71-0x00000000023E0000-0x0000000002460000-memory.dmp

Filesize
512KB

Download
memory/1968-65-0x00000000023E0000-0x0000000002460000-memory.dmp

Filesize
512KB

Download
memory/1968-72-0x00000000023E0000-0x0000000002460000-memory.dmp

Filesize
512KB

Download
memory/1968-64-0x0000000002320000-0x0000000002328000-memory.dmp

Filesize
32KB

Download
memory/1968-63-0x000000001B270000-0x000000001B552000-memory.dmp

Filesize
2.9MB

Download
memory/1968-70-0x00000000023E0000-0x0000000002460000-memory.dmp

Filesize
512KB

Download
memory/1968-69-0x00000000023E0000-0x0000000002460000-memory.dmp

Filesize
512KB

Download
memory/1968-67-0x00000000023E0000-0x0000000002460000-memory.dmp

Filesize
512KB

Download
memory/1968-66-0x00000000023E0000-0x0000000002460000-memory.dmp

Filesize
512KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

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Downloads