cryptolocker | 4bf65d181881bbc86ad154f3352acd2ebb5f76893c9e7b3b05230726d1a7e3b8

Analysis

max time kernel
178s
max time network
182s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
21-10-2022 18:47

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General

Target

4bf65d181881bbc86ad154f3352acd2ebb5f76893c9e7b3b05230726d1a7e3b8.exe
Size

362KB
MD5

5a4add9136f4bab32c9576ea03133c3e
SHA1

c72534ef23599b2801da50e2e7e5206c8c57ab1e
SHA256

4bf65d181881bbc86ad154f3352acd2ebb5f76893c9e7b3b05230726d1a7e3b8
SHA512

4c31c713cb37b68410c90f5b5c802c65c2ced6d08ce7d7ff59b4fd14a2f01481161a118fbdace4773e4291b44056076740c73f14a73beef25d21b5ac6d8b026d
SSDEEP

6144:KBSqu8gXoPBY1NCA/wEMWxHBzXvNWgTO3x5N22vWvLRKKAX5l++SyVI:zbVSBYj9px/1T85I2vCMX5l+Zn

Score

10^/10

cryptolocker persistence ransomware

Malware Config

Signatures

CryptoLocker
Ransomware family with multiple variants.
ransomware cryptolocker

Executes dropped EXE 2 IoCs

pid	Process
976	Avywuixyxmexxtr.exe
1320	Avywuixyxmexxtr.exe

Deletes itself 1 IoCs

pid	Process
976	Avywuixyxmexxtr.exe

Loads dropped DLL 1 IoCs

pid	Process
896	4bf65d181881bbc86ad154f3352acd2ebb5f76893c9e7b3b05230726d1a7e3b8.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Windows\CurrentVersion\Run\CryptoLocker = "C:\\Users\\Admin\\AppData\\Local\\Avywuixyxmexxtr.exe"	Avywuixyxmexxtr.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	Avywuixyxmexxtr.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*CryptoLocker = "C:\\Users\\Admin\\AppData\\Local\\Avywuixyxmexxtr.exe"	Avywuixyxmexxtr.exe
Key created	\REGISTRY\USER\S-1-5-21-3845472200-3839195424-595303356-1000\Software\Microsoft\Windows\CurrentVersion\Run	Avywuixyxmexxtr.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 896 wrote to memory of 976	896	4bf65d181881bbc86ad154f3352acd2ebb5f76893c9e7b3b05230726d1a7e3b8.exe	28
PID 896 wrote to memory of 976	896	4bf65d181881bbc86ad154f3352acd2ebb5f76893c9e7b3b05230726d1a7e3b8.exe	28
PID 896 wrote to memory of 976	896	4bf65d181881bbc86ad154f3352acd2ebb5f76893c9e7b3b05230726d1a7e3b8.exe	28
PID 896 wrote to memory of 976	896	4bf65d181881bbc86ad154f3352acd2ebb5f76893c9e7b3b05230726d1a7e3b8.exe	28
PID 976 wrote to memory of 1320	976	Avywuixyxmexxtr.exe	29
PID 976 wrote to memory of 1320	976	Avywuixyxmexxtr.exe	29
PID 976 wrote to memory of 1320	976	Avywuixyxmexxtr.exe	29
PID 976 wrote to memory of 1320	976	Avywuixyxmexxtr.exe	29

C:\Users\Admin\AppData\Local\Temp\4bf65d181881bbc86ad154f3352acd2ebb5f76893c9e7b3b05230726d1a7e3b8.exe
"C:\Users\Admin\AppData\Local\Temp\4bf65d181881bbc86ad154f3352acd2ebb5f76893c9e7b3b05230726d1a7e3b8.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:896
- C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe
  "C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe" "-rC:\Users\Admin\AppData\Local\Temp\4bf65d181881bbc86ad154f3352acd2ebb5f76893c9e7b3b05230726d1a7e3b8.exe"
  2⤵
  - Executes dropped EXE
  - Deletes itself
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:976
- - C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe
    "C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe" -w11c
    3⤵
    - Executes dropped EXE
    PID:1320

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe

Filesize
362KB

MD5
5a4add9136f4bab32c9576ea03133c3e

SHA1
c72534ef23599b2801da50e2e7e5206c8c57ab1e

SHA256
4bf65d181881bbc86ad154f3352acd2ebb5f76893c9e7b3b05230726d1a7e3b8

SHA512
4c31c713cb37b68410c90f5b5c802c65c2ced6d08ce7d7ff59b4fd14a2f01481161a118fbdace4773e4291b44056076740c73f14a73beef25d21b5ac6d8b026d

Download Submit
C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe

Filesize
362KB

MD5
5a4add9136f4bab32c9576ea03133c3e

SHA1
c72534ef23599b2801da50e2e7e5206c8c57ab1e

SHA256
4bf65d181881bbc86ad154f3352acd2ebb5f76893c9e7b3b05230726d1a7e3b8

SHA512
4c31c713cb37b68410c90f5b5c802c65c2ced6d08ce7d7ff59b4fd14a2f01481161a118fbdace4773e4291b44056076740c73f14a73beef25d21b5ac6d8b026d

Download Submit
C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe

Filesize
362KB

MD5
5a4add9136f4bab32c9576ea03133c3e

SHA1
c72534ef23599b2801da50e2e7e5206c8c57ab1e

SHA256
4bf65d181881bbc86ad154f3352acd2ebb5f76893c9e7b3b05230726d1a7e3b8

SHA512
4c31c713cb37b68410c90f5b5c802c65c2ced6d08ce7d7ff59b4fd14a2f01481161a118fbdace4773e4291b44056076740c73f14a73beef25d21b5ac6d8b026d

Download Submit
\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe

Filesize
362KB

MD5
5a4add9136f4bab32c9576ea03133c3e

SHA1
c72534ef23599b2801da50e2e7e5206c8c57ab1e

SHA256
4bf65d181881bbc86ad154f3352acd2ebb5f76893c9e7b3b05230726d1a7e3b8

SHA512
4c31c713cb37b68410c90f5b5c802c65c2ced6d08ce7d7ff59b4fd14a2f01481161a118fbdace4773e4291b44056076740c73f14a73beef25d21b5ac6d8b026d

Download Submit
memory/896-54-0x0000000076411000-0x0000000076413000-memory.dmp

Filesize
8KB

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