purecrypter | c8c503cad1ff92d608501ae76a4e9b6947580cf686d8867e8f060e37c1a1618a

Analysis

max time kernel
39s
max time network
44s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
27-01-2023 19:21

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General

Target

tmp.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/820-55-0x000000001BBC0000-0x000000001BEB2000-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:

tmp.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3406023954-474543476-3319432036-1000\Software\Microsoft\Windows\CurrentVersion\Run\Ntumenbu = "\"C:\\Users\\Admin\\AppData\\Roaming\\Bfkqfsqy\\Ntumenbu.exe\""	tmp.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 2 IoCs

Processes:

powershell.exetmp.exe

pid process

564 powershell.exe
820 tmp.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

powershell.exetmp.exe

description pid process

Token: SeDebugPrivilege 564 powershell.exe
Token: SeDebugPrivilege 820 tmp.exe
Token: SeDebugPrivilege 820 tmp.exe

pid	process
564	powershell.exe
820	tmp.exe

description	pid	process
Token: SeDebugPrivilege	564	powershell.exe
Token: SeDebugPrivilege	820	tmp.exe
Token: SeDebugPrivilege	820	tmp.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

tmp.exe

description	pid	process	target process
PID 820 wrote to memory of 564	820	tmp.exe	powershell.exe
PID 820 wrote to memory of 564	820	tmp.exe	powershell.exe
PID 820 wrote to memory of 564	820	tmp.exe	powershell.exe

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:820

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:564

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Web Service

T1102

Impact

Replay Monitor

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Downloads

memory/564-64-0x0000000002714000-0x0000000002717000-memory.dmp

Filesize
12KB

Download
memory/564-63-0x000000000271B000-0x000000000273A000-memory.dmp

Filesize
124KB

Download
memory/564-57-0x000007FEFB8F1000-0x000007FEFB8F3000-memory.dmp

Filesize
8KB

Download
memory/564-56-0x0000000000000000-mapping.dmp

Download
memory/564-65-0x000000000271B000-0x000000000273A000-memory.dmp

Filesize
124KB

Download
memory/564-59-0x000007FEEC3B0000-0x000007FEECDD3000-memory.dmp

Filesize
10.1MB

Download
memory/564-60-0x000007FEEB850000-0x000007FEEC3AD000-memory.dmp

Filesize
11.4MB

Download
memory/564-61-0x0000000002714000-0x0000000002717000-memory.dmp

Filesize
12KB

Download
memory/564-62-0x000000001B6E0000-0x000000001B9DF000-memory.dmp

Filesize
3.0MB

Download
memory/820-58-0x000000001AEF7000-0x000000001AF16000-memory.dmp

Filesize
124KB

Download
memory/820-66-0x000000001D110000-0x000000001D1E6000-memory.dmp

Filesize
856KB

Download
memory/820-55-0x000000001BBC0000-0x000000001BEB2000-memory.dmp

Filesize
2.9MB

Download
memory/820-54-0x00000000008D0000-0x0000000000BC2000-memory.dmp

Filesize
2.9MB

Download
memory/820-67-0x000000001D710000-0x000000001D7A6000-memory.dmp

Filesize
600KB

Download
memory/820-68-0x000000001DFD0000-0x000000001E084000-memory.dmp

Filesize
720KB

Download
memory/820-69-0x000000001CBE0000-0x000000001CC36000-memory.dmp

Filesize
344KB

Download
memory/820-70-0x000000001C230000-0x000000001C2CA000-memory.dmp

Filesize
616KB

Download
memory/820-71-0x000000001D1F0000-0x000000001D244000-memory.dmp

Filesize
336KB

Download
memory/820-72-0x000000001E080000-0x000000001E0CC000-memory.dmp

Filesize
304KB

Download
memory/820-73-0x000000001E540000-0x000000001E594000-memory.dmp

Filesize
336KB

Download
memory/820-74-0x000000001AEF7000-0x000000001AF16000-memory.dmp

Filesize
124KB

Download