locky | c4370948896e4b1d2fded7d0a85127f5c2e1564e41ecbc47c810ae76b1473ac4

Analysis

max time kernel
152s
max time network
121s
platform
windows7_x64
resource
win7-en-20211104
submitted
17/11/2021, 11:48

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General

Target

20161205_3f1d7664595d2ff885b9fa3bf8a96bbf.js
Size

13KB
MD5

181a0ef665583fb02134e9effa90f86f
SHA1

815bd5e80fb2ba833514548c70a5e35014a993b1
SHA256

c4370948896e4b1d2fded7d0a85127f5c2e1564e41ecbc47c810ae76b1473ac4
SHA512

650b1f77700ea60e0c8bfca25b364a35722a1f6b26ed2358d553adb0ae100ececffb11fa1af873ecf2318e3002e115fb2ce5d7b98f5e16c6428baae18e2d0a10

Score

10^/10

locky locky_osiris ransomware suricata

Malware Config

Signatures

Locky
Ransomware strain released in 2016, with advanced features like anti-analysis.
ransomware locky
Locky (Osiris variant)
Variant of the Locky ransomware seen in the wild since early 2017.
ransomware locky_osiris
suricata: ET MALWARE Nemucod JS Downloader Aug 01 2017
suricata: ET MALWARE Nemucod JS Downloader Aug 01 2017
suricata

Blocklisted process makes network request 9 IoCs

flow	pid	Process
5	1048	wscript.exe
7	1048	wscript.exe
9	1048	wscript.exe
11	1048	wscript.exe
12	1028	rundll32.exe
15	1028	rundll32.exe
16	1028	rundll32.exe
17	1028	rundll32.exe
18	1028	rundll32.exe

Modifies extensions of user files 2 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File opened for modification	\??\c:\Users\Admin\Pictures\SplitSkip.tiff	rundll32.exe
File opened for modification	\??\c:\Users\Admin\Pictures\MergeExpand.tiff	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
1028	rundll32.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1048 wrote to memory of 1676	1048	wscript.exe	30
PID 1048 wrote to memory of 1676	1048	wscript.exe	30
PID 1048 wrote to memory of 1676	1048	wscript.exe	30
PID 1676 wrote to memory of 1028	1676	rundll32.exe	31
PID 1676 wrote to memory of 1028	1676	rundll32.exe	31
PID 1676 wrote to memory of 1028	1676	rundll32.exe	31
PID 1676 wrote to memory of 1028	1676	rundll32.exe	31
PID 1676 wrote to memory of 1028	1676	rundll32.exe	31
PID 1676 wrote to memory of 1028	1676	rundll32.exe	31
PID 1676 wrote to memory of 1028	1676	rundll32.exe	31

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\20161205_3f1d7664595d2ff885b9fa3bf8a96bbf.js
1⤵
- Blocklisted process makes network request
- Suspicious use of WriteProcessMemory
PID:1048
- C:\Windows\System32\rundll32.exe
  "C:\Windows\System32\rundll32.exe" C:\Users\Admin\AppData\Local\Temp\EBB852~1.ZK,TOxNKCZjUHCfTf9D
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1676
- - C:\Windows\SysWOW64\rundll32.exe
    "C:\Windows\System32\rundll32.exe" C:\Users\Admin\AppData\Local\Temp\EBB852~1.ZK,TOxNKCZjUHCfTf9D
    3⤵
    - Blocklisted process makes network request
    - Modifies extensions of user files
    - Loads dropped DLL
    PID:1028

Network

MITRE ATT&CK Enterprise v6

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/1028-58-0x0000000074E51000-0x0000000074E53000-memory.dmp

Filesize
8KB

Download
memory/1028-60-0x00000000000F0000-0x00000000000F1000-memory.dmp

Filesize
4KB

Download
memory/1028-61-0x00000000749F0000-0x0000000074A2A000-memory.dmp

Filesize
232KB

Download