farfli | b61b5907aa86eb6baee8b8a7cb52bb053d3318e3a16b7d38f7a483d1b31398e9

Analysis

max time kernel
149s
max time network
151s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
15/04/2026, 16:01

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General

Target
2026-04-15_846a77f5b680643442d1f8a679b0e71a_elex_wannacry.exe
Size 100KB
Sample260415-tglfnsft2v
SHA256 b61b5907aa86eb6baee8b8a7cb52bb053d3318e3a16b7d38f7a483d1b31398e9
MD5 846a77f5b680643442d1f8a679b0e71a
SHA1 a3e376bfc62de555129fc5a79f74259176451466
SHA512 3608688fa544de564a1ec7aeed448dd77b208e662382f0aac3acfb4ab291b8cb7b03288fbd5f716c7a3cc3de2125a2ba09e7a59a9fe9ee8a23615e5b1aa35eb6
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX47d:piAXaKDeKNnD36cb8tI7
TLSH
T15CA3AE42ABF08761E06199B506735B629EB3FC2B193482277BD7B70E9C34F40EE21355
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery farfli persistence spyware stealer

Malware Config

Signatures

Family: Farfli
Farfli is a Windows backdoor written in C++.
backdoor farfli

Detects Farfli Backdoor 4 IoCs

resource	yara_rule
behavioral2/memory/4568-10-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/4568-11-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli
behavioral2/memory/4568-12-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/4568-13-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/4568-10-0x0000000010000000-0x000000001002E000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4568-12-0x0000000010000000-0x000000001002E000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Badlisted process makes network request 15 IoCs

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

flow	pid	Process
1	4568	rundll32.exe
2	4568	rundll32.exe
3	4568	rundll32.exe
4	4568	rundll32.exe
5	4568	rundll32.exe
6	4568	rundll32.exe
7	4568	rundll32.exe
8	4568	rundll32.exe
9	4568	rundll32.exe
10	4568	rundll32.exe
13	4568	rundll32.exe
14	4568	rundll32.exe
15	4568	rundll32.exe
16	4568	rundll32.exe
17	4568	rundll32.exe

Deletes itself 1 IoCs

pid	Process
3676	gvaux.exe

Executes dropped EXE 1 IoCs

pid	Process
3676	gvaux.exe

Loads dropped DLL 1 IoCs

pid	Process
4568	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-1-5-21-3119821332-640943685-2562343641-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\uztcg\\gmtvlwrvk.dll\",GetWindowClass"	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)	\??\g:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\r:	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)	\??\k:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\a:	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	2026-04-15_846a77f5b680643442d1f8a679b0e71a_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	gvaux.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.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
3076	cmd.exe
2816	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 opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	rundll32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rundll32.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2816	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4568	rundll32.exe
4568	rundll32.exe
4568	rundll32.exe
4568	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4568	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1040	2026-04-15_846a77f5b680643442d1f8a679b0e71a_elex_wannacry.exe
3676	gvaux.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1040 wrote to memory of 3076	1040	2026-04-15_846a77f5b680643442d1f8a679b0e71a_elex_wannacry.exe	79
PID 3076 wrote to memory of 2816	3076	cmd.exe	81
PID 3076 wrote to memory of 3676	3076	cmd.exe	82
PID 3676 wrote to memory of 4568	3676	gvaux.exe	83

C:\Users\Admin\AppData\Local\Temp\2026-04-15_846a77f5b680643442d1f8a679b0e71a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-15_846a77f5b680643442d1f8a679b0e71a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1040
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\gvaux.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-15_846a77f5b680643442d1f8a679b0e71a_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3076
- - 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:2816
- - \??\c:\gvaux.exe
    c:\gvaux.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-15_846a77f5b680643442d1f8a679b0e71a_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3676
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\uztcg\gmtvlwrvk.dll",GetWindowClass c:\gvaux.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:4568

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

gvaux.exe

Path C:\gvaux.exe
Size 100KB
SHA256 6c7e96d706ada7243055d471156fcc25d719be9c7dbad5b6acf7ba584dbbb92f
MD5 245e39fcd7c2872b5d25da462782bf43
SHA1 90577d88cb738da271a28306ff71df58756b8ad6
SHA512 c5398f163798342bd97c116394b2b792064fdc2f003e14a1ad474675dcb25e8a2a1d9a87b2c92ec37999960c306d2d6f4e226a58a4b20b10559fd156a1d2157c
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX47dL:piAXaKDeKNnD36cb8tI75
TLSH
T1BCA3AE42ABF087A1E06199B506735B629EB3FC2B193482277BD7B70E9C34F40EE21355
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

gmtvlwrvk.dll

Path \??\c:\uztcg\gmtvlwrvk.dll
Size 46KB
SHA256 f57f9e54f4774c2b944fb070ae0c2a02cbb4b7686ab3207544c3ccaff0ff3dd9
MD5 a3fd41430ddcaa55fde840788925406a
SHA1 dbdd87f5c1bbf6a6f44c2e2c4744675d5e4e75c2
SHA512 23109572cfc9a282ea3ec84d93bfe02303d27f365ad2d9f47f6234f91da14c64f80133cc5e49746dfcb65d2454b7e7c13eff59ba4bbc18e09d2fb1c630ba59c9
SSDEEP 768:2sUfnvxs6iLlhpfFPtnQf7kifD/v7yb9Bh7Cb0VQJojZC/xjTk:2sJT1qf4W/vub9nnV1jZC/xE
TLSH
T19D2302C8A6F08EF3D2F90B7980E046DCDCFDB939877381150566008E7C71057FA446AA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1040-0-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/1040-2-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/3676-7-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/4568-10-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4568-11-0x0000000010001000-0x000000001001E000-memory.dmp

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memory/4568-12-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4568-13-0x0000000010001000-0x000000001001E000-memory.dmp

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