farfli | 77bbcb835f59bbb2374f6e5757af5528f494b30314a2d068d6f8a2c93830840a

Analysis

max time kernel
149s
max time network
144s
platform
windows10-2004_x64
resource
win10v2004-20260130-en
resource tags

arch:x64arch:x86image:win10v2004-20260130-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
19/04/2026, 13:45

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General

Target
2026-04-19_b2501f92b50b077878ebfa447d780055_elex_wannacry.exe
Size 156KB
Sample260419-q2pr2sg18v
SHA256 77bbcb835f59bbb2374f6e5757af5528f494b30314a2d068d6f8a2c93830840a
MD5 b2501f92b50b077878ebfa447d780055
SHA1 84cce71f704cbd8af33d57379f9605b62bff770b
SHA512 64437b76310685f6e08ea35845898058d0ef123811e0d07ccdeccc13381f7b79bffbf6eec693565d0c15401420119925acb0ceb03ee35f9726d0f22ab5f72d01
SSDEEP 1536:fli0XaKn5gYkqDqgEeEHgUyQLrdcUcsA08IzYJzKsoVXOeqD7hi/x0rTE86mwYUi:di0XaKncqY31L2WXb0E86mwYUi
TLSH
T1E5F38C26E7E58542E3B28F7046A35B63AF71FC145AED8B4F7B40635E5838B00ED29364
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

aspackv2 backdoor bootkit discovery farfli gh0strat persistence rat spyware stealer

Malware Config

Extracted

Family

gh0strat

67.229.62.194:3201
http://67.229.62.197:805/index.php
http://67.229.62.198:803/

Attributes

user_agent
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C))

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)

Signatures

Family: Farfli
Farfli is a Windows backdoor written in C++.
backdoor farfli
Family: Gh0strat
Gh0st RAT is a remote access tool (RAT) with its source code public and it has been used by multiple Chinese groups.
rat gh0strat

Detects Farfli Backdoor 7 IoCs

resource	yara_rule
behavioral1/memory/4236-13-0x0000000010000000-0x0000000010036000-memory.dmp	family_farfli
behavioral1/memory/4236-14-0x0000000010000000-0x0000000010036000-memory.dmp	family_farfli
behavioral1/memory/4236-15-0x0000000010000000-0x0000000010036000-memory.dmp	family_farfli
behavioral1/memory/4236-16-0x0000000010000000-0x0000000010036000-memory.dmp	family_farfli
behavioral1/memory/4236-18-0x0000000010000000-0x0000000010036000-memory.dmp	family_farfli
behavioral1/memory/4236-19-0x0000000010000000-0x0000000010036000-memory.dmp	family_farfli
behavioral1/memory/4236-20-0x0000000010000000-0x0000000010036000-memory.dmp	family_farfli

Custom signature

Detects executables containing base64 encoded User Agent 7 IoCs

resource	yara_rule
behavioral1/memory/4236-13-0x0000000010000000-0x0000000010036000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/4236-14-0x0000000010000000-0x0000000010036000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/4236-15-0x0000000010000000-0x0000000010036000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/4236-16-0x0000000010000000-0x0000000010036000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/4236-18-0x0000000010000000-0x0000000010036000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/4236-19-0x0000000010000000-0x0000000010036000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/4236-20-0x0000000010000000-0x0000000010036000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Badlisted process makes network request 8 IoCs

Network request originating from process or tool commonly abused by malware.

flow	pid	Process
12	4236	rundll32.exe
15	4236	rundll32.exe
16	4236	rundll32.exe
17	4236	rundll32.exe
31	4236	rundll32.exe
35	4236	rundll32.exe
38	4236	rundll32.exe
48	4236	rundll32.exe

ASPack v2.12-2.42 1 IoCs

Detects executables packed with ASPack v2.12-2.42

aspackv2

resource	yara_rule
behavioral1/files/0x0008000000024316-10.dat	aspack_v212_v242

Deletes itself 1 IoCs

pid	Process
3836	nguamnd.exe

Executes dropped EXE 1 IoCs

pid	Process
3836	nguamnd.exe

Loads dropped DLL 1 IoCs

pid	Process
4236	rundll32.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2714754311-527593155-1440850301-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\nnezi\\ahtju.dll\",AbortProc"	rundll32.exe

Enumerates connected drives 3 TTPs 23 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PHYSICALDRIVE0	rundll32.exe

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-19_b2501f92b50b077878ebfa447d780055_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	nguamnd.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
4912	cmd.exe
8	PING.EXE

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rundll32.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	rundll32.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
8	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4236	rundll32.exe
4236	rundll32.exe
4236	rundll32.exe
4236	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4236	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1408	2026-04-19_b2501f92b50b077878ebfa447d780055_elex_wannacry.exe
3836	nguamnd.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1408 wrote to memory of 4912	1408	2026-04-19_b2501f92b50b077878ebfa447d780055_elex_wannacry.exe	84
PID 4912 wrote to memory of 8	4912	cmd.exe	86
PID 4912 wrote to memory of 3836	4912	cmd.exe	87
PID 3836 wrote to memory of 4236	3836	nguamnd.exe	88

C:\Users\Admin\AppData\Local\Temp\2026-04-19_b2501f92b50b077878ebfa447d780055_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-19_b2501f92b50b077878ebfa447d780055_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1408
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\nguamnd.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-19_b2501f92b50b077878ebfa447d780055_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:4912
- - C:\Windows\SysWOW64\PING.EXE
    ping 127.0.0.1 -n 2
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:8
- - \??\c:\nguamnd.exe
    c:\nguamnd.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-19_b2501f92b50b077878ebfa447d780055_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3836
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\nnezi\ahtju.dll",AbortProc c:\nguamnd.exe
      4⤵
      Badlisted process makes network request
      Loads dropped DLL
      Adds Run key to start application
      Enumerates connected drives
      Writes to the Master Boot Record (MBR)
      System Location Discovery: System Language Discovery
      Checks processor information in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4236

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

nguamnd.exe

Path C:\nguamnd.exe
Size 156KB
SHA256 54d6bf8403056009a87ca6e6bd7109d62da4d4bc8d1061ff441d8da4fba43aec
MD5 fe40d0ada73d9da314eda53bbcefc2f0
SHA1 cd80d71b328840e1dc5a24dadeb0f9f9b1a9d2cf
SHA512 20bc4006219b4b819137b92b4e701d35a72f3d19018abe38afdd94c4d3f44677b621788b633cca9bc1976584abfaf58870b5dfd709469a1ed14591c59c29137e
SSDEEP 1536:fli0XaKn5gYkqDqgEeEHgUyQLrdcUcsA08IzYJzKsoVXOeqD7hi/x0rTE86mwYU5:di0XaKncqY31L2WXb0E86mwYUiG
TLSH
T1BAF37C26E7E58542E3B24F7046A35B63AF71FC145AED8B4F7B40635E9838B00ED29364
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

ahtju.dll

Path \??\c:\nnezi\ahtju.dll
Size 87KB
SHA256 37ab4b7ee8f6b61c3854af4ed4676fd0d69f0260fb1296ad75e57aa08e1eeb03
MD5 a2c2137ff7abf6be6bcae4252c394a69
SHA1 07b402104df563f9486c2eef975fee70f65a5145
SHA512 5d05ed7c55bee8f41502acaea3d41fcf4421ad641d43f0b97b4cdc8fe584983da7712c561a53b708e88391df7929914746115700ae733155418693bcec6989a9
SSDEEP 1536:Z9f99U7uHXjIdqsxng0ZsiG4gYV82mwx86aY1Enb0jv4WDBT:bfTVHXEdqRYu2mwxB11EbiT1
TLSH
T10B93E08EBFD80A7FC6BF123244A7D636D2723C117B199D5231DE8E1F38561096B0A768
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1408-3-0x0000000000400000-0x0000000000428000-memory.dmp

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memory/1408-1-0x0000000000405000-0x0000000000406000-memory.dmp

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memory/1408-0-0x0000000000400000-0x0000000000428000-memory.dmp

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memory/3836-7-0x0000000000400000-0x0000000000428000-memory.dmp

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memory/3836-9-0x0000000000400000-0x0000000000428000-memory.dmp

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memory/4236-13-0x0000000010000000-0x0000000010036000-memory.dmp

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memory/4236-12-0x0000000010000000-0x0000000010036000-memory.dmp

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memory/4236-14-0x0000000010000000-0x0000000010036000-memory.dmp

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memory/4236-15-0x0000000010000000-0x0000000010036000-memory.dmp

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memory/4236-16-0x0000000010000000-0x0000000010036000-memory.dmp

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memory/4236-18-0x0000000010000000-0x0000000010036000-memory.dmp

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memory/4236-19-0x0000000010000000-0x0000000010036000-memory.dmp

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memory/4236-20-0x0000000010000000-0x0000000010036000-memory.dmp

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