farfli | 974051fa3d6cc4eaea9aa652eb8262753da0a4cf8b46a1f446a4d1ebedf14648

Analysis

max time kernel
149s
max time network
146s
platform
windows10-2004_x64
resource
win10v2004-20260130-en
resource tags

arch:x64arch:x86image:win10v2004-20260130-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
24/04/2026, 10:58

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General

Target
2026-04-24_881b5ecc2389f1d6486cec0c9a516844_elex_wannacry.exe
Size 149KB
Sample260424-m233wsfx7t
SHA256 974051fa3d6cc4eaea9aa652eb8262753da0a4cf8b46a1f446a4d1ebedf14648
MD5 881b5ecc2389f1d6486cec0c9a516844
SHA1 ea240b7335215f02326387242a5c48ed6a3a8d7c
SHA512 2b62c0cdf8773628a26fb3cc0e660cbc68653ef48a11b4705b573bfcd0dd08b3612ab9eb369f598eae5275b489d3a82498df144fb4f1823cc5f416e2be68ff43
SSDEEP 3072:DK4RNx6gb4RoIwZpx10ZENfrGSQ7sDU/ySkNAq0:Dl6exiZuKoDkySkNAD
TLSH
T1D8E3D0CE1F7ACFDBE1201C75D1A412F782529C99EB2157978385FD9EB832C819C3612A
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 2 IoCs

resource	yara_rule
behavioral1/memory/5608-12-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral1/memory/5608-13-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral1/memory/5608-12-0x0000000010000000-0x000000001002E000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/5608-13-0x0000000010000000-0x000000001002E000-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
13	5608	rundll32.exe
14	5608	rundll32.exe
15	5608	rundll32.exe
16	5608	rundll32.exe
32	5608	rundll32.exe
35	5608	rundll32.exe
43	5608	rundll32.exe
44	5608	rundll32.exe

Deletes itself 1 IoCs

pid	Process
1228	yrxucbuve.exe

Executes dropped EXE 1 IoCs

pid	Process
1228	yrxucbuve.exe

Loads dropped DLL 1 IoCs

pid	Process
5608	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-1-5-21-721190819-434563495-2007910846-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\wqzhb\\fsxzefu.dll\",init"	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)	\??\j:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\h:	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)	\??\r:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\e:	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yrxucbuve.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-24_881b5ecc2389f1d6486cec0c9a516844_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.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
3716	cmd.exe
788	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
788	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
5608	rundll32.exe
5608	rundll32.exe
5608	rundll32.exe
5608	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5608	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
5456	2026-04-24_881b5ecc2389f1d6486cec0c9a516844_elex_wannacry.exe
1228	yrxucbuve.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 5456 wrote to memory of 3716	5456	2026-04-24_881b5ecc2389f1d6486cec0c9a516844_elex_wannacry.exe	84
PID 3716 wrote to memory of 788	3716	cmd.exe	86
PID 3716 wrote to memory of 1228	3716	cmd.exe	87
PID 1228 wrote to memory of 5608	1228	yrxucbuve.exe	88

C:\Users\Admin\AppData\Local\Temp\2026-04-24_881b5ecc2389f1d6486cec0c9a516844_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-24_881b5ecc2389f1d6486cec0c9a516844_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5456
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\yrxucbuve.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-24_881b5ecc2389f1d6486cec0c9a516844_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3716
- - 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:788
- - \??\c:\yrxucbuve.exe
    c:\yrxucbuve.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-24_881b5ecc2389f1d6486cec0c9a516844_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1228
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\wqzhb\fsxzefu.dll",init c:\yrxucbuve.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:5608

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

yrxucbuve.exe

Path C:\yrxucbuve.exe
Size 149KB
SHA256 eabe86c21389c9c4d65b84c1866ba2f12f90d861961197ae0d8e3ba4c059d310
MD5 6514c2705c111fb9b2c59027d0b7b8c0
SHA1 f4e7f3bb809dc2cd7ea4ddec6c64109ddd060321
SHA512 9cfd547d2fa3e188863957aff54c296289501210627f5bbbcae9a43ace2a4336e327d79b4646b626c5a0c61b6138fec7ff7e8be94460512ef93518af6825743d
SSDEEP 3072:DK4RNx6gb4RoIwZpx10ZENfrGSQ7sDU/ySkNAqd:Dl6exiZuKoDkySkNA4
TLSH
T1E3E3D0CE1F7ACFDBE1201C75D1A816F742529C99EB2457978385FD8EB832C819C36126
MD5 SHA1 SHA512 SSDEEP TLSH

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fsxzefu.dll

Path \??\c:\wqzhb\fsxzefu.dll
Size 42KB
SHA256 c7c41689de030df0f78f471422fa2a6383b36e77c94e7f6f124a96feb3e27ed7
MD5 36e3fb5964d663272cf1169e1e1ca478
SHA1 58115e08b49505bcbbb5c88a28a86222ba18d5d4
SHA512 daff53b11aa400437a06287707a334a09661c1ef7d0fd8beaf1a874c79c16fe45bd1188343d0623e839d3ead5ea2dd90896e37ccf3b252c7220c74989a9ba442
SSDEEP 768:t0inj1jJ5OeUMhBNSqHvMjjAipMkuG30sv2xEZkWldADAKPIp:t0ipV5uMhBt0jjAiusv22ZkWTOAKP8
TLSH
T1D813E19B6BEC7029FDD22BB4F4F66815EEB63F388CB2C70E114941AB1C3A9D51251706
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1228-7-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/5456-0-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/5456-2-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/5608-10-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/5608-11-0x0000000002700000-0x0000000002701000-memory.dmp

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memory/5608-12-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/5608-13-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/5608-15-0x0000000002700000-0x0000000002701000-memory.dmp

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memory/5608-14-0x0000000002570000-0x00000000025F7000-memory.dmp

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