cryptolocker | ba1a0c0e8d7887e73c5dc27466516ed96eb6ee5490a6977498f060e6cb5b05f5

Analysis

max time kernel
150s
max time network
153s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
07-02-2024 09:01

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General

Target

2024-02-07_86771976a99148ecd44c3033fe04e02c_cryptolocker.exe
Size

370KB
MD5

86771976a99148ecd44c3033fe04e02c
SHA1

8e692c3c6af7840eab6080ed26d011820318c5e2
SHA256

ba1a0c0e8d7887e73c5dc27466516ed96eb6ee5490a6977498f060e6cb5b05f5
SHA512

448e9d6f040d77aeb99616acd64ebe7ddad39eb70212ce15828babf8d7c6d3e6835f42447a854482d29b3103d33e2a96c97c4198db6406cb29f5bd1658b4efff
SSDEEP

6144:lHrjZhghBCLlsBxFJWCDA/tHHTdtlXvdWgTO3x5N22vWvLRKKAX5l++SyVISD:BZhghBCMxFJWCE/tHzh/FT85I2vCMX5V

Score

10^/10

cryptolocker persistence ransomware

Malware Config

Signatures

CryptoLocker
Ransomware family with multiple variants.
ransomware cryptolocker

Deletes itself 1 IoCs

pid	Process
3068	Avywuixyxmexxtr.exe

Executes dropped EXE 2 IoCs

pid	Process
3068	Avywuixyxmexxtr.exe
2728	Avywuixyxmexxtr.exe

Loads dropped DLL 2 IoCs

pid	Process
1168	2024-02-07_86771976a99148ecd44c3033fe04e02c_cryptolocker.exe
3068	Avywuixyxmexxtr.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3308111660-3636268597-2291490419-1000\Software\Microsoft\Windows\CurrentVersion\Run\CryptoLocker = "C:\\Users\\Admin\\AppData\\Local\\Avywuixyxmexxtr.exe"	Avywuixyxmexxtr.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3308111660-3636268597-2291490419-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*CryptoLocker = "C:\\Users\\Admin\\AppData\\Local\\Avywuixyxmexxtr.exe"	Avywuixyxmexxtr.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1168 wrote to memory of 3068	1168	2024-02-07_86771976a99148ecd44c3033fe04e02c_cryptolocker.exe	28
PID 1168 wrote to memory of 3068	1168	2024-02-07_86771976a99148ecd44c3033fe04e02c_cryptolocker.exe	28
PID 1168 wrote to memory of 3068	1168	2024-02-07_86771976a99148ecd44c3033fe04e02c_cryptolocker.exe	28
PID 1168 wrote to memory of 3068	1168	2024-02-07_86771976a99148ecd44c3033fe04e02c_cryptolocker.exe	28
PID 3068 wrote to memory of 2728	3068	Avywuixyxmexxtr.exe	29
PID 3068 wrote to memory of 2728	3068	Avywuixyxmexxtr.exe	29
PID 3068 wrote to memory of 2728	3068	Avywuixyxmexxtr.exe	29
PID 3068 wrote to memory of 2728	3068	Avywuixyxmexxtr.exe	29

C:\Users\Admin\AppData\Local\Temp\2024-02-07_86771976a99148ecd44c3033fe04e02c_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-02-07_86771976a99148ecd44c3033fe04e02c_cryptolocker.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1168
- C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe
  "C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe" "-rC:\Users\Admin\AppData\Local\Temp\2024-02-07_86771976a99148ecd44c3033fe04e02c_cryptolocker.exe"
  2⤵
  - Deletes itself
  - Executes dropped EXE
  - Loads dropped DLL
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:3068
- - C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe
    "C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe" -w120
    3⤵
    - Executes dropped EXE
    PID:2728

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
370KB

MD5
86771976a99148ecd44c3033fe04e02c

SHA1
8e692c3c6af7840eab6080ed26d011820318c5e2

SHA256
ba1a0c0e8d7887e73c5dc27466516ed96eb6ee5490a6977498f060e6cb5b05f5

SHA512
448e9d6f040d77aeb99616acd64ebe7ddad39eb70212ce15828babf8d7c6d3e6835f42447a854482d29b3103d33e2a96c97c4198db6406cb29f5bd1658b4efff

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads