nefilim | dea93a0cf6e55dcfd1a4b9c10324b0b4edea974cc60878296601e6dc9f16c166

Analysis

max time kernel
120s
max time network
120s
platform
windows7_x64
resource
win7-20240220-en
resource tags

arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system
submitted
19-04-2024 18:21

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General

Target

5ab834f599c6ad35fcd0a168d93c52c399c6de7d1c20f33e25cb1fdb25aec9c6.exe
Size

35KB
MD5

70e4b9b7a83473687e5784489d556c87
SHA1

1f594456d88591d3a88e1cdd4e93c6c4e59b746c
SHA256

5ab834f599c6ad35fcd0a168d93c52c399c6de7d1c20f33e25cb1fdb25aec9c6
SHA512

89878d4a72521a9742fe671979065ea210f7c78975040c28c0c5ec4733d90680d71b45bfe5582baf6e4bc62850777b1b2a68ad8e2dcaf95edc19544622855d2c
SSDEEP

768:+8SQb5hyBBIqa1L4SvEUfBNEUuQjreZBLjpKgk:+8SkLq2VrM8EUuoyjp

Score

10^/10

nefilim ransomware upx

Malware Config

Signatures

Nefilim
Ransomware first seen in early 2020 which shares code with the Nemty family. Rewritten in Golang in July 2020.
ransomware nefilim
Renames multiple (214) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware
Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

1888 cmd.exe

pid	process
1888	cmd.exe

UPX packed file 2 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
behavioral1/memory/3036-0-0x0000000000BF0000-0x0000000000C05000-memory.dmp	upx
behavioral1/memory/3036-508-0x0000000000BF0000-0x0000000000C05000-memory.dmp	upx

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

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

Processes:

timeout.exe

pid process

328 timeout.exe

pid	process
328	timeout.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

5ab834f599c6ad35fcd0a168d93c52c399c6de7d1c20f33e25cb1fdb25aec9c6.execmd.exe

description	pid	process	target process
PID 3036 wrote to memory of 1888	3036	5ab834f599c6ad35fcd0a168d93c52c399c6de7d1c20f33e25cb1fdb25aec9c6.exe	cmd.exe
PID 3036 wrote to memory of 1888	3036	5ab834f599c6ad35fcd0a168d93c52c399c6de7d1c20f33e25cb1fdb25aec9c6.exe	cmd.exe
PID 3036 wrote to memory of 1888	3036	5ab834f599c6ad35fcd0a168d93c52c399c6de7d1c20f33e25cb1fdb25aec9c6.exe	cmd.exe
PID 3036 wrote to memory of 1888	3036	5ab834f599c6ad35fcd0a168d93c52c399c6de7d1c20f33e25cb1fdb25aec9c6.exe	cmd.exe
PID 1888 wrote to memory of 328	1888	cmd.exe	timeout.exe
PID 1888 wrote to memory of 328	1888	cmd.exe	timeout.exe
PID 1888 wrote to memory of 328	1888	cmd.exe	timeout.exe
PID 1888 wrote to memory of 328	1888	cmd.exe	timeout.exe

C:\Users\Admin\AppData\Local\Temp\5ab834f599c6ad35fcd0a168d93c52c399c6de7d1c20f33e25cb1fdb25aec9c6.exe
"C:\Users\Admin\AppData\Local\Temp\5ab834f599c6ad35fcd0a168d93c52c399c6de7d1c20f33e25cb1fdb25aec9c6.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3036
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c timeout /t 3 /nobreak && del "C:\Users\Admin\AppData\Local\Temp\5ab834f599c6ad35fcd0a168d93c52c399c6de7d1c20f33e25cb1fdb25aec9c6.exe" /s /f /q
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:1888
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 3 /nobreak
    3⤵
    - Delays execution with timeout.exe
    PID:328

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/3036-0-0x0000000000BF0000-0x0000000000C05000-memory.dmp

Filesize
84KB

Download
memory/3036-508-0x0000000000BF0000-0x0000000000C05000-memory.dmp

Filesize
84KB

Download