cryptolocker | 60f4de6a343a174eebb2455834b4333103d0159b5a975f793e98b91bcc96594a

Analysis

max time kernel
150s
max time network
152s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
22-12-2023 12:24

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General

Target

8bd61c883e9ffc637c7dd0bf7ab93d6b.exe
Size

696KB
MD5

8bd61c883e9ffc637c7dd0bf7ab93d6b
SHA1

fd2fcc0d26d4aff9adbed3b57befb2568222ff38
SHA256

60f4de6a343a174eebb2455834b4333103d0159b5a975f793e98b91bcc96594a
SHA512

e37e32b1bf6b6a63ec02855cf540d7c188b308c332efd63b82a32b2344b7d8d0fdd9a2eade329d7ac682a2ab4133dac19fbf2c1a5bdb2d6d6b37402a4628bd49
SSDEEP

12288:IsmFRVtoSeN6hocevUGQ8zRNXnf8HWpKKXNAh/gEHjE:IsgvEVcevrsiKmWh/g+

Score

10^/10

cryptolocker persistence ransomware

Malware Config

Signatures

CryptoLocker
Ransomware family with multiple variants.
ransomware cryptolocker
Deletes itself 1 IoCs

Processes:

Avywuixyxmexxtr.exe

pid process

2592 Avywuixyxmexxtr.exe
Executes dropped EXE 2 IoCs

Processes:

Avywuixyxmexxtr.exeAvywuixyxmexxtr.exe

pid process

2592 Avywuixyxmexxtr.exe
2952 Avywuixyxmexxtr.exe
Loads dropped DLL 2 IoCs

Processes:

8bd61c883e9ffc637c7dd0bf7ab93d6b.exe

pid process

2100 8bd61c883e9ffc637c7dd0bf7ab93d6b.exe
2100 8bd61c883e9ffc637c7dd0bf7ab93d6b.exe

pid	process
2592	Avywuixyxmexxtr.exe

pid	process
2592	Avywuixyxmexxtr.exe
2952	Avywuixyxmexxtr.exe

pid	process
2100	8bd61c883e9ffc637c7dd0bf7ab93d6b.exe
2100	8bd61c883e9ffc637c7dd0bf7ab93d6b.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

Avywuixyxmexxtr.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-452311807-3713411997-1028535425-1000\Software\Microsoft\Windows\CurrentVersion\Run\CryptoLocker = "C:\\Users\\Admin\\AppData\\Local\\Avywuixyxmexxtr.exe"	Avywuixyxmexxtr.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-452311807-3713411997-1028535425-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*CryptoLocker = "C:\\Users\\Admin\\AppData\\Local\\Avywuixyxmexxtr.exe"	Avywuixyxmexxtr.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

8bd61c883e9ffc637c7dd0bf7ab93d6b.exeAvywuixyxmexxtr.exe

description	pid	process	target process
PID 2100 wrote to memory of 2592	2100	8bd61c883e9ffc637c7dd0bf7ab93d6b.exe	Avywuixyxmexxtr.exe
PID 2100 wrote to memory of 2592	2100	8bd61c883e9ffc637c7dd0bf7ab93d6b.exe	Avywuixyxmexxtr.exe
PID 2100 wrote to memory of 2592	2100	8bd61c883e9ffc637c7dd0bf7ab93d6b.exe	Avywuixyxmexxtr.exe
PID 2100 wrote to memory of 2592	2100	8bd61c883e9ffc637c7dd0bf7ab93d6b.exe	Avywuixyxmexxtr.exe
PID 2592 wrote to memory of 2952	2592	Avywuixyxmexxtr.exe	Avywuixyxmexxtr.exe
PID 2592 wrote to memory of 2952	2592	Avywuixyxmexxtr.exe	Avywuixyxmexxtr.exe
PID 2592 wrote to memory of 2952	2592	Avywuixyxmexxtr.exe	Avywuixyxmexxtr.exe
PID 2592 wrote to memory of 2952	2592	Avywuixyxmexxtr.exe	Avywuixyxmexxtr.exe

C:\Users\Admin\AppData\Local\Temp\8bd61c883e9ffc637c7dd0bf7ab93d6b.exe
"C:\Users\Admin\AppData\Local\Temp\8bd61c883e9ffc637c7dd0bf7ab93d6b.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2100
- C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe
  "C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe" "-rC:\Users\Admin\AppData\Local\Temp\8bd61c883e9ffc637c7dd0bf7ab93d6b.exe"
  2⤵
  - Deletes itself
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:2592
- - C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe
    "C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe" -w12c
    3⤵
    - Executes dropped EXE
    PID:2952

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

Replay Monitor

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Downloads

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

Filesize
696KB

MD5
8bd61c883e9ffc637c7dd0bf7ab93d6b

SHA1
fd2fcc0d26d4aff9adbed3b57befb2568222ff38

SHA256
60f4de6a343a174eebb2455834b4333103d0159b5a975f793e98b91bcc96594a

SHA512
e37e32b1bf6b6a63ec02855cf540d7c188b308c332efd63b82a32b2344b7d8d0fdd9a2eade329d7ac682a2ab4133dac19fbf2c1a5bdb2d6d6b37402a4628bd49

Download Submit
memory/2100-0-0x0000000000400000-0x00000000004D5000-memory.dmp

Filesize
852KB

Download
memory/2100-1-0x0000000000220000-0x0000000000221000-memory.dmp

Filesize
4KB

Download
memory/2100-2-0x0000000000400000-0x00000000004D5000-memory.dmp

Filesize
852KB

Download
memory/2100-14-0x0000000000400000-0x00000000004D5000-memory.dmp

Filesize
852KB

Download
memory/2592-15-0x0000000000400000-0x00000000004D5000-memory.dmp

Filesize
852KB

Download
memory/2592-16-0x0000000000400000-0x00000000004D5000-memory.dmp

Filesize
852KB

Download
memory/2592-24-0x0000000000400000-0x00000000004D5000-memory.dmp

Filesize
852KB

Download
memory/2592-26-0x0000000000400000-0x00000000004D5000-memory.dmp

Filesize
852KB

Download
memory/2592-28-0x0000000000220000-0x0000000000221000-memory.dmp

Filesize
4KB

Download
memory/2952-21-0x0000000000400000-0x00000000004D5000-memory.dmp

Filesize
852KB

Download
memory/2952-25-0x0000000000400000-0x00000000004D5000-memory.dmp

Filesize
852KB

Download