nefilim | bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb

General

Target

bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.exe
Size

36KB
MD5

644b931e6a016a6146ebe8068f68e4cb
SHA1

87e2ad3e9f1ae9e1340fb3c70013fd6b508e2364
SHA256

bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb
SHA512

683152462a60d24dd9151754ebc5184a4753afbfeb4a86f74d5d815ae1d3738631bd8f89c51fe56b31ddc14a590579233a0a1a5562ba49e5486387be3bb989ba

Score

10^/10

nefilim persistence 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 5 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

Processes:

bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.exe

description	ioc	process
File renamed	C:\Users\Admin\Pictures\DisconnectConvertFrom.tif => C:\Users\Admin\Pictures\DisconnectConvertFrom.tif.NEFILIM	bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.exe
File renamed	C:\Users\Admin\Pictures\NewMount.png => C:\Users\Admin\Pictures\NewMount.png.NEFILIM	bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.exe
File opened for modification	C:\Users\Admin\Pictures\OutClear.tiff	bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.exe
File renamed	C:\Users\Admin\Pictures\OutClear.tiff => C:\Users\Admin\Pictures\OutClear.tiff.NEFILIM	bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.exe
File renamed	C:\Users\Admin\Pictures\ResizeInstall.tif => C:\Users\Admin\Pictures\ResizeInstall.tif.NEFILIM	bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.exe

Sets service image path in registry 2 TTPs
persistence

Registry Run Keys / Startup Folder
T1060

Modify Registry
T1112

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\Control Panel\International\Geo\Nation	bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.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

944 timeout.exe

pid	process
944	timeout.exe

Modifies data under HKEY_USERS 41 IoCs

Processes:

WaaSMedicAgent.exe

description	ioc	process
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CTLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\Certificates	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CRLs	WaaSMedicAgent.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CTLs	WaaSMedicAgent.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.execmd.exe

description	pid	process	target process
PID 3728 wrote to memory of 1364	3728	bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.exe	cmd.exe
PID 3728 wrote to memory of 1364	3728	bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.exe	cmd.exe
PID 3728 wrote to memory of 1364	3728	bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.exe	cmd.exe
PID 1364 wrote to memory of 944	1364	cmd.exe	timeout.exe
PID 1364 wrote to memory of 944	1364	cmd.exe	timeout.exe
PID 1364 wrote to memory of 944	1364	cmd.exe	timeout.exe

C:\Users\Admin\AppData\Local\Temp\bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.exe
"C:\Users\Admin\AppData\Local\Temp\bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.exe"
1⤵
- Modifies extensions of user files
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3728
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c timeout /t 3 /nobreak && del "C:\Users\Admin\AppData\Local\Temp\bc1b0daa577dc2cc96cc24512d13267773d0b6c8ce0e768db41aa0ec00f128eb.exe" /s /f /q
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1364
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 3 /nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:944

C:\Windows\System32\WaaSMedicAgent.exe
C:\Windows\System32\WaaSMedicAgent.exe fb8c4272e30e5d6048a61f5efad77f8f /MdMpPJ1D06TDUBVvcW6ng.0.1.0.0.0
1⤵
- Modifies data under HKEY_USERS
PID:3140