purecrypter | c8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a

Analysis

max time kernel
70s
max time network
133s
platform
windows10-1703_x64
resource
win10-20220812-en
resource tags

arch:x64arch:x86image:win10-20220812-enlocale:en-usos:windows10-1703-x64system
submitted
27-01-2023 14:19

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General

Target

c8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a.exe
Size

2.9MB
MD5

44622abb2bd17b2c4734318dc5de7f6a
SHA1

c9d2392a4660759b72bda955a76c4ffd198b4383
SHA256

c8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a
SHA512

158f90bc5ab6727a4b0dc63567b1a1375feb4d9e5afe83aa63d0c1c91f11445d04a44f87e34566c513ec221538f4c4c281db323c325fe9a8513ce394465f5784
SSDEEP

49152:6aZXhxYiUWQ6ZMPFuqY6hYFJqlveNDhPpg5PvKM6E+mqp1p1KoHzx:jZRyiRQ6ZSuqXhcBNWXKBmqpj1bzx

Score

10^/10

purecrypter downloader loader persistence

Malware Config

Signatures

Detect PureCrypter injector 1 IoCs

loader

Processes:

resource	yara_rule
behavioral1/memory/2272-117-0x00000224FA0F0000-0x00000224FA3E2000-memory.dmp	family_purecrypter

PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
loader downloader purecrypter

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

c8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1099808672-3828198950-1535142148-1000\Software\Microsoft\Windows\CurrentVersion\Run\Ntumenbu = "\"C:\\Users\\Admin\\AppData\\Roaming\\Bfkqfsqy\\Ntumenbu.exe\""	c8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102
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 4 IoCs

Processes:

powershell.exec8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a.exe

pid process

2172 powershell.exe
2172 powershell.exe
2172 powershell.exe
2272 c8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a.exe

pid	process
2172	powershell.exe
2172	powershell.exe
2172	powershell.exe
2272	c8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

powershell.exec8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a.exe

description	pid	process
Token: SeDebugPrivilege	2172	powershell.exe
Token: SeDebugPrivilege	2272	c8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a.exe
Token: SeDebugPrivilege	2272	c8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a.exe

Suspicious use of WriteProcessMemory 2 IoCs

Processes:

c8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a.exe

description	pid	process	target process
PID 2272 wrote to memory of 2172	2272	c8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a.exe	powershell.exe
PID 2272 wrote to memory of 2172	2272	c8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a.exe	powershell.exe

C:\Users\Admin\AppData\Local\Temp\c8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a.exe
"C:\Users\Admin\AppData\Local\Temp\c8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2272

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:2172

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Web Service

T1102

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2172-119-0x0000000000000000-mapping.dmp

Download
memory/2172-126-0x0000021838C20000-0x0000021838C96000-memory.dmp

Filesize
472KB

Download
memory/2272-135-0x00000224FAD90000-0x00000224FAE26000-memory.dmp

Filesize
600KB

Download
memory/2272-118-0x00000224F80E0000-0x00000224F8102000-memory.dmp

Filesize
136KB

Download
memory/2272-117-0x00000224FA0F0000-0x00000224FA3E2000-memory.dmp

Filesize
2.9MB

Download
memory/2272-134-0x00000224FA850000-0x00000224FA926000-memory.dmp

Filesize
856KB

Download
memory/2272-116-0x00000224F7A90000-0x00000224F7D82000-memory.dmp

Filesize
2.9MB

Download
memory/2272-136-0x00000224FA940000-0x00000224FA9DA000-memory.dmp

Filesize
616KB

Download
memory/2272-137-0x00000224FA64A000-0x00000224FA64F000-memory.dmp

Filesize
20KB

Download
memory/2272-138-0x00000224FAE30000-0x00000224FAEE4000-memory.dmp

Filesize
720KB

Download
memory/2272-139-0x00000224FAFF0000-0x00000224FB046000-memory.dmp

Filesize
344KB

Download
memory/2272-140-0x00000224FB050000-0x00000224FB0A4000-memory.dmp

Filesize
336KB

Download
memory/2272-141-0x00000224FB250000-0x00000224FB29C000-memory.dmp

Filesize
304KB

Download
memory/2272-142-0x00000224FB2A0000-0x00000224FB2F4000-memory.dmp

Filesize
336KB

Download
memory/2272-143-0x00000224FA64A000-0x00000224FA64F000-memory.dmp

Filesize
20KB

Download