nefilim | fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7

General

Target

fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe
Size

58KB
MD5

6196c083282e7fe87d8039336e707e73
SHA1

eea8b6f959c6dd33609ff1552521cbe9dc169872
SHA256

fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7
SHA512

2c7c653597d89e6c4f7041cfc6a9805f5aa9737ec2978b2231880480fd6f875e1726c3cefa0f3149d5b409a56caf8dd8bd1bc5daee62dab00da1fbcfeabddbbc

Score

10^/10

nefilim ransomware

Malware Config

Extracted

Path

C:\NEFILIM-DECRYPT.txt

Ransom Note

All of your files have been encrypted with military grade algorithms. We ensure that the only way to retrieve your data is with our software. We will make sure you retrieve your data swiftly and securely when our demands are met. Restoration of your data requires a private key which only we possess. A large amount of your private files have been extracted and is kept in a secure location. If you do not contact us in seven working days of the breach we will start leaking the data. After you contact us we will provide you proof that your files have been extracted. To confirm that our decryption software works email to us 2 files from random computers. You will receive further instructions after you send us the test files. [email protected] [email protected] [email protected]

Emails

[email protected]

Signatures

Nefilim
Ransomware first seen in early 2020 which shares code with the Nemty family. Rewritten in Golang in July 2020.
ransomware nefilim

Modifies extensions of user files 8 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe

description	ioc	process
File renamed	C:\Users\Admin\Pictures\ConvertFromRename.png => C:\Users\Admin\Pictures\ConvertFromRename.png.NEFILIM	fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe
File renamed	C:\Users\Admin\Pictures\ConvertStop.raw => C:\Users\Admin\Pictures\ConvertStop.raw.NEFILIM	fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe
File renamed	C:\Users\Admin\Pictures\DisconnectUpdate.raw => C:\Users\Admin\Pictures\DisconnectUpdate.raw.NEFILIM	fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe
File opened for modification	C:\Users\Admin\Pictures\InvokeExit.tiff	fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe
File renamed	C:\Users\Admin\Pictures\InvokeExit.tiff => C:\Users\Admin\Pictures\InvokeExit.tiff.NEFILIM	fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe
File renamed	C:\Users\Admin\Pictures\ProtectDeny.raw => C:\Users\Admin\Pictures\ProtectDeny.raw.NEFILIM	fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe
File renamed	C:\Users\Admin\Pictures\ReadSwitch.crw => C:\Users\Admin\Pictures\ReadSwitch.crw.NEFILIM	fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe
File renamed	C:\Users\Admin\Pictures\UninstallExpand.tif => C:\Users\Admin\Pictures\UninstallExpand.tif.NEFILIM	fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe

Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

636 cmd.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

1012 timeout.exe

pid	process
636	cmd.exe

pid	process
1012	timeout.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.execmd.exe

description	pid	process	target process
PID 1260 wrote to memory of 636	1260	fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe	cmd.exe
PID 1260 wrote to memory of 636	1260	fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe	cmd.exe
PID 1260 wrote to memory of 636	1260	fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe	cmd.exe
PID 1260 wrote to memory of 636	1260	fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe	cmd.exe
PID 636 wrote to memory of 1012	636	cmd.exe	timeout.exe
PID 636 wrote to memory of 1012	636	cmd.exe	timeout.exe
PID 636 wrote to memory of 1012	636	cmd.exe	timeout.exe
PID 636 wrote to memory of 1012	636	cmd.exe	timeout.exe

C:\Users\Admin\AppData\Local\Temp\fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe
"C:\Users\Admin\AppData\Local\Temp\fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe"
1⤵
- Modifies extensions of user files
- Suspicious use of WriteProcessMemory
PID:1260
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c timeout /t 3 /nobreak && del "C:\Users\Admin\AppData\Local\Temp\fdaefa45c8679a161c6590b8f5bb735c12c9768172f81c930bb68c93a53002f7.exe" /s /f /q
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:636
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 3 /nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:1012

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1260-54-0x0000000075D61000-0x0000000075D63000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing