purecrypter | 92f5bc1c04cfa529056b7f6cead4ec4aa2ce280ea51b166e4f62b7c40e0e32de

General

Target

file.exe
Size

24KB
MD5

4edc2181db86513f593f18793d30ebf9
SHA1

33a4a18759143c258703147bb5a05a19f9be65d6
SHA256

92f5bc1c04cfa529056b7f6cead4ec4aa2ce280ea51b166e4f62b7c40e0e32de
SHA512

1f74d7a3d3a956ab8c472d1977279b8cff4a3989b03c7c78d704ee18a34e98546a7678baaddcc5c22930f627f3ffde2101a613f13fa4d6306b74cdc4fbf240b5
SSDEEP

96:TbpKgeeUZvHZ6mkIWjT4nLkjDUPRx0UxkRbkPf4LNiRB4e3T3e3Lvn1fzNt:Y8AvQdIWfoLkjD8TOQPf4L9bnr

Score

10^/10

purecrypter smokeloader backdoor downloader loader persistence trojan

Malware Config

Signatures

Detect PureCrypter injector 1 IoCs

loader

Processes:

resource	yara_rule
behavioral1/memory/1652-56-0x0000000005300000-0x0000000005368000-memory.dmp	family_purecrypter

Detects Smokeloader packer 4 IoCs

Processes:

resource	yara_rule
behavioral1/memory/664-66-0x0000000000400000-0x0000000000409000-memory.dmp	family_smokeloader
behavioral1/memory/664-67-0x0000000000402EF0-mapping.dmp	family_smokeloader
behavioral1/memory/664-69-0x0000000000400000-0x0000000000409000-memory.dmp	family_smokeloader
behavioral1/memory/664-70-0x0000000000400000-0x0000000000409000-memory.dmp	family_smokeloader

PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
loader downloader purecrypter
SmokeLoader
Modular backdoor trojan in use since 2014.
trojan backdoor smokeloader

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

file.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3385717845-2518323428-350143044-1000\Software\Microsoft\Windows\CurrentVersion\Run\Goyyvx = "\"C:\\Users\\Admin\\AppData\\Roaming\\Neyachzs\\Goyyvx.exe\""	file.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

file.exe

description pid process target process

PID 1652 set thread context of 664 1652 file.exe file.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

description	pid	process	target process
PID 1652 set thread context of 664	1652	file.exe	file.exe

Checks SCSI registry key(s) 3 TTPs 3 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

file.exe

description	ioc	process
Key enumerated	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	file.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	file.exe
Key queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	file.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

powershell.exefile.exe

pid	process
1176	powershell.exe
664	file.exe
664	file.exe
1248
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Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

pid process

1248
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

file.exe

pid process

664 file.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

file.exepowershell.exe

description pid process

Token: SeDebugPrivilege 1652 file.exe
Token: SeDebugPrivilege 1176 powershell.exe

pid	process
1248

pid	process
664	file.exe

description	pid	process
Token: SeDebugPrivilege	1652	file.exe
Token: SeDebugPrivilege	1176	powershell.exe

Suspicious use of WriteProcessMemory 11 IoCs

Processes:

file.exe

description	pid	process	target process
PID 1652 wrote to memory of 1176	1652	file.exe	powershell.exe
PID 1652 wrote to memory of 1176	1652	file.exe	powershell.exe
PID 1652 wrote to memory of 1176	1652	file.exe	powershell.exe
PID 1652 wrote to memory of 1176	1652	file.exe	powershell.exe
PID 1652 wrote to memory of 664	1652	file.exe	file.exe
PID 1652 wrote to memory of 664	1652	file.exe	file.exe
PID 1652 wrote to memory of 664	1652	file.exe	file.exe
PID 1652 wrote to memory of 664	1652	file.exe	file.exe
PID 1652 wrote to memory of 664	1652	file.exe	file.exe
PID 1652 wrote to memory of 664	1652	file.exe	file.exe
PID 1652 wrote to memory of 664	1652	file.exe	file.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1652

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:1176

C:\Users\Admin\AppData\Local\Temp\file.exe
C:\Users\Admin\AppData\Local\Temp\file.exe
2⤵
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
PID:664

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

2

T1082

Query Registry

1

T1012

Peripheral Device Discovery

1

T1120

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

memory/664-63-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/664-70-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/664-69-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/664-67-0x0000000000402EF0-mapping.dmp

Download
memory/664-66-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/664-64-0x0000000000400000-0x0000000000409000-memory.dmp

Filesize
36KB

Download
memory/1176-61-0x000000006E5E0000-0x000000006EB8B000-memory.dmp

Filesize
5.7MB

Download
memory/1176-62-0x000000006E5E0000-0x000000006EB8B000-memory.dmp

Filesize
5.7MB

Download
memory/1176-60-0x000000006E5E0000-0x000000006EB8B000-memory.dmp

Filesize
5.7MB

Download
memory/1176-58-0x0000000000000000-mapping.dmp

Download
memory/1652-54-0x0000000001020000-0x000000000102C000-memory.dmp

Filesize
48KB

Download
memory/1652-57-0x0000000005990000-0x0000000005A22000-memory.dmp

Filesize
584KB

Download
memory/1652-56-0x0000000005300000-0x0000000005368000-memory.dmp

Filesize
416KB

Download
memory/1652-55-0x0000000074FD1000-0x0000000074FD3000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads