nefilim | d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3

General

Target

d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe
Size

70KB
MD5

8f90539c405672016c0dec7ac3574eea
SHA1

bd59d7c734ca2f9cbaf7f12bc851f7dce94955d4
SHA256

d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3
SHA512

887131d01da7d7afcff628eb1c81de7b6e6a2bb38167377dd104e175a2fec27d0d1ef0d966b376408d305488e0319b781ff996da3e5be60628088cb369869a94

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 13 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe

description	ioc	process
File opened for modification	C:\Users\Admin\Pictures\ConvertFromPublish.tiff	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe
File renamed	C:\Users\Admin\Pictures\ConvertFromPublish.tiff => C:\Users\Admin\Pictures\ConvertFromPublish.tiff.NEFILIM	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe
File renamed	C:\Users\Admin\Pictures\InstallOptimize.png => C:\Users\Admin\Pictures\InstallOptimize.png.NEFILIM	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe
File renamed	C:\Users\Admin\Pictures\ReceiveEnter.png => C:\Users\Admin\Pictures\ReceiveEnter.png.NEFILIM	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe
File renamed	C:\Users\Admin\Pictures\MountMove.tif => C:\Users\Admin\Pictures\MountMove.tif.NEFILIM	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe
File renamed	C:\Users\Admin\Pictures\PushMerge.tif => C:\Users\Admin\Pictures\PushMerge.tif.NEFILIM	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe
File opened for modification	C:\Users\Admin\Pictures\RevokeRemove.tiff	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe
File renamed	C:\Users\Admin\Pictures\RevokeRemove.tiff => C:\Users\Admin\Pictures\RevokeRemove.tiff.NEFILIM	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe
File renamed	C:\Users\Admin\Pictures\AssertFind.png => C:\Users\Admin\Pictures\AssertFind.png.NEFILIM	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe
File renamed	C:\Users\Admin\Pictures\BackupStart.png => C:\Users\Admin\Pictures\BackupStart.png.NEFILIM	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe
File renamed	C:\Users\Admin\Pictures\DismountUnpublish.tif => C:\Users\Admin\Pictures\DismountUnpublish.tif.NEFILIM	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe
File renamed	C:\Users\Admin\Pictures\ImportFormat.crw => C:\Users\Admin\Pictures\ImportFormat.crw.NEFILIM	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe
File renamed	C:\Users\Admin\Pictures\StopDeny.png => C:\Users\Admin\Pictures\StopDeny.png.NEFILIM	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe

Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

1172 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

556 timeout.exe

pid	process
1172	cmd.exe

pid	process
556	timeout.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.execmd.exe

description	pid	process	target process
PID 1960 wrote to memory of 1172	1960	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe	cmd.exe
PID 1960 wrote to memory of 1172	1960	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe	cmd.exe
PID 1960 wrote to memory of 1172	1960	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe	cmd.exe
PID 1960 wrote to memory of 1172	1960	d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe	cmd.exe
PID 1172 wrote to memory of 556	1172	cmd.exe	timeout.exe
PID 1172 wrote to memory of 556	1172	cmd.exe	timeout.exe
PID 1172 wrote to memory of 556	1172	cmd.exe	timeout.exe
PID 1172 wrote to memory of 556	1172	cmd.exe	timeout.exe

C:\Users\Admin\AppData\Local\Temp\d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe
"C:\Users\Admin\AppData\Local\Temp\d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe"
1⤵
- Modifies extensions of user files
- Suspicious use of WriteProcessMemory
PID:1960

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c timeout /t 3 /nobreak && del "C:\Users\Admin\AppData\Local\Temp\d4492a9eb36f87a9b3156b59052ebaf10e264d5d1ce4c015a6b0d205614e58e3.sample.exe" /s /f /q
2⤵
- Deletes itself
- Suspicious use of WriteProcessMemory
PID:1172

C:\Windows\SysWOW64\timeout.exe
timeout /t 3 /nobreak
3⤵
- Delays execution with timeout.exe
PID:556

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/556-62-0x0000000000000000-mapping.dmp

Download
memory/1172-61-0x0000000000000000-mapping.dmp

Download
memory/1960-60-0x0000000075201000-0x0000000075203000-memory.dmp

Filesize
8KB

Download

Analysis

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