farfli | 96f365ee749cc630824a228860b11598ffc8f60eecf5e699b28d4a96eb1431ff

Analysis

max time kernel
150s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
06/05/2026, 02:23

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General

Target
2026-05-06_edda60d1677da965b12619dda299e92e_elex_wannacry.exe
Size 113KB
Sample260506-cva4esdx5k
SHA256 96f365ee749cc630824a228860b11598ffc8f60eecf5e699b28d4a96eb1431ff
MD5 edda60d1677da965b12619dda299e92e
SHA1 f53ea0331c041f1d52228fed24713c687f2ce9b5
SHA512 5c7177afba6911358322f48de137f59d9a5347199fab5f1cae192edbd7717a589214003edfe098aafc13009ab17504f03c6df4cf84a11824262081c1334f2170
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX4:piAXaKDeKNnD36cb8tI
TLSH
T1ADB39E12ABF0C6A5E0665CB5467757619EB2FC2A2924832777C6B70FEC30F04EE25394
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/4372-10-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/4372-11-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli
behavioral2/memory/4372-12-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/4372-14-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/4372-10-0x0000000010000000-0x000000001002E000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4372-12-0x0000000010000000-0x000000001002E000-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	4372	rundll32.exe
2	4372	rundll32.exe
3	4372	rundll32.exe
4	4372	rundll32.exe
5	4372	rundll32.exe
6	4372	rundll32.exe
7	4372	rundll32.exe
8	4372	rundll32.exe
9	4372	rundll32.exe
10	4372	rundll32.exe
13	4372	rundll32.exe
14	4372	rundll32.exe
15	4372	rundll32.exe
16	4372	rundll32.exe
17	4372	rundll32.exe

Deletes itself 1 IoCs

pid	Process
1240	ksaqb.exe

Executes dropped EXE 1 IoCs

pid	Process
1240	ksaqb.exe

Loads dropped DLL 1 IoCs

pid	Process
4372	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-1-5-21-3847269522-1618051987-1942096715-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\fpuuwn\\sksly.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)	\??\i:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	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	2026-05-06_edda60d1677da965b12619dda299e92e_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	ksaqb.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
1636	PING.EXE
3692	cmd.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
1636	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4372	rundll32.exe
4372	rundll32.exe
4372	rundll32.exe
4372	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4372	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3816	2026-05-06_edda60d1677da965b12619dda299e92e_elex_wannacry.exe
1240	ksaqb.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3816 wrote to memory of 3692	3816	2026-05-06_edda60d1677da965b12619dda299e92e_elex_wannacry.exe	80
PID 3692 wrote to memory of 1636	3692	cmd.exe	82
PID 3692 wrote to memory of 1240	3692	cmd.exe	83
PID 1240 wrote to memory of 4372	1240	ksaqb.exe	84

C:\Users\Admin\AppData\Local\Temp\2026-05-06_edda60d1677da965b12619dda299e92e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-06_edda60d1677da965b12619dda299e92e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3816
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\ksaqb.exe "C:\Users\Admin\AppData\Local\Temp\2026-05-06_edda60d1677da965b12619dda299e92e_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3692
- - 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:1636
- - \??\c:\ksaqb.exe
    c:\ksaqb.exe "C:\Users\Admin\AppData\Local\Temp\2026-05-06_edda60d1677da965b12619dda299e92e_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1240
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\fpuuwn\sksly.dll",GetWindowClass c:\ksaqb.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:4372

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

ksaqb.exe

Path C:\ksaqb.exe
Size 113KB
SHA256 c53bd964824bf307ef9b090ca31bb79728b488f2d9c8a3755a16a62e8965f60e
MD5 0204842b87a7ff530464fccfe3af680e
SHA1 7e6e81252bb743ec804e112cf021d5528ad2c3e9
SHA512 09bfbbc4284376bdc2b8f6c9e8c2ffb88150187ca03f0dfe8b317b37595459ba91ca2fcf3509538c2365df9afe77df50ea07215d7ca678e9a9d129051b84645c
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX49:piAXaKDeKNnD36cb8tI9
TLSH
T11BB39E12ABF0C6A5E0665CB5467757619EB2FC2A2924832777C6B70FEC30F04EE25394
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

sksly.dll

Path \??\c:\fpuuwn\sksly.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/1240-7-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/3816-0-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/3816-2-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/4372-10-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4372-11-0x0000000010001000-0x000000001001E000-memory.dmp

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memory/4372-12-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4372-14-0x0000000010001000-0x000000001001E000-memory.dmp

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memory/4372-13-0x0000000000F10000-0x00000000010BC000-memory.dmp

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