farfli | 62311b84a2d43fd8754a03b3bab83f063b1a93b808e311fbd672d3b454d7914c

General

Target
2026-08-30_873cba79ae5fd0f961a311961bfad4ed_coinminer_elex_wannacry.exe
Size 145KB
Sample260831-km727aycnd
SHA256 62311b84a2d43fd8754a03b3bab83f063b1a93b808e311fbd672d3b454d7914c
MD5 873cba79ae5fd0f961a311961bfad4ed
SHA1 af4db34b5e89fd16962124ae75193946ccb80385
SHA512 06eed315a601cb8fb4f37c8775a36dd040efe09cc3cc50a3a82bdb57f5fafdbf11d83b12d95706fbda9f8883d44fc16417a8c66bb553a09dee7b8b3aa656a3a9
SSDEEP 1536:L3aacznhtqkUla/NGVcJ/gAqcX0JMseuiGSeNVvDi0tMuUJJny3GM+9xx:+aCqc9rqzMseNoVv9EJFnM8xx
TLSH
T10DE3370263F6C194F0B21A34CA3646F04B7ABC69FA70921B17847E4EBD31A15ED21777
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery execution farfli persistence spyware stealer upx

Malware Config

Signatures

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

Detects Farfli Backdoor 1 IoCs

resource	yara_rule
behavioral2/memory/864-10-0x0000000010000000-0x0000000010032000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 1 IoCs

resource	yara_rule
behavioral2/memory/864-10-0x0000000010000000-0x0000000010032000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/1300-0-0x0000000000400000-0x0000000000423000-memory.dmp	UPX
behavioral2/memory/1300-2-0x0000000000400000-0x0000000000423000-memory.dmp	UPX
behavioral2/files/0x000b000000011390-3.dat	UPX
behavioral2/memory/5360-6-0x0000000000400000-0x0000000000423000-memory.dmp	UPX

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
7	864	rundll32.exe
9	864	rundll32.exe
11	864	rundll32.exe
10	864	rundll32.exe
12	864	rundll32.exe
13	864	rundll32.exe
16	864	rundll32.exe
17	864	rundll32.exe

Deletes itself 1 IoCs

pid	Process
5360	rffavku.exe

Executes dropped EXE 1 IoCs

pid	Process
5360	rffavku.exe

Loads dropped DLL 1 IoCs

pid	Process
864	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-1-5-21-1738198120-2966725515-3980530802-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\kucpy\\miuii.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)	\??\w:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
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)	\??\i:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\v:	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

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/1300-0-0x0000000000400000-0x0000000000423000-memory.dmp	upx
behavioral2/memory/1300-2-0x0000000000400000-0x0000000000423000-memory.dmp	upx
behavioral2/files/0x000b000000011390-3.dat	upx
behavioral2/memory/5360-6-0x0000000000400000-0x0000000000423000-memory.dmp	upx

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4724	cmd.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	2026-08-30_873cba79ae5fd0f961a311961bfad4ed_coinminer_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	rffavku.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
4724	cmd.exe
4608	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
4608	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
864	rundll32.exe
864	rundll32.exe
864	rundll32.exe
864	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	864	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1300	2026-08-30_873cba79ae5fd0f961a311961bfad4ed_coinminer_elex_wannacry.exe
5360	rffavku.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1300 wrote to memory of 4724	1300	2026-08-30_873cba79ae5fd0f961a311961bfad4ed_coinminer_elex_wannacry.exe	89
PID 4724 wrote to memory of 4608	4724	cmd.exe	91
PID 4724 wrote to memory of 5360	4724	cmd.exe	92
PID 5360 wrote to memory of 864	5360	rffavku.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-30_873cba79ae5fd0f961a311961bfad4ed_coinminer_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-30_873cba79ae5fd0f961a311961bfad4ed_coinminer_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1300
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\rffavku.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-30_873cba79ae5fd0f961a311961bfad4ed_coinminer_elex_wannacry.exe"
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:4724
- - 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:4608
- - \??\c:\rffavku.exe
    c:\rffavku.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-30_873cba79ae5fd0f961a311961bfad4ed_coinminer_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:5360
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\kucpy\miuii.dll",init c:\rffavku.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:864

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Peripheral Device Discovery

Query Registry

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

miuii.dll

Path \??\c:\kucpy\miuii.dll
Size 50KB
SHA256 a632527bcd457c9a4cfce83e7a9a675baff790b0279de5d8ea3192dfb2dd888a
MD5 ab32c5bfd7ecfbe9ed733dfb81210933
SHA1 4d5c6e7a0031691f12e78b096ff928b0d55bdfab
SHA512 59b971146292074d76d23d5f26889108f4d6e33804332449f4c589bf8a8d53e37ac8dfea47e9d3c5ae0f382ae1acf25c4968bea87b3f5ff9d51f2274229c1ab5
SSDEEP 1536:mrrG57ZqLLpf+Xz+HOtygmRnO/x5Rq8Gm:mwKGqutWM/x281
TLSH
T12033F1F4EFB4E067ECBA5F743E6A6215DA727B10C63188EA518090135F335CACA18717
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

rffavku.exe

Path \??\c:\rffavku.exe
Size 145KB
SHA256 a9d103db109fa161fecc2d3c5649f8e6d455d01244d6fffb0490a2035df9c945
MD5 230aad2bfcb8f399361759a148e29a44
SHA1 dbb56af8d87be0e1b2ee1ca1d3613c181f629108
SHA512 20038a9f6a2052ab2c8f8f12959fa352c9cca10143bc361af6a05fc4deabb5ae9f6d990bdf64a05e061371de41e817e362cb7e6ffae073a5f4a1566d3a6f6192
SSDEEP 1536:L3aacznhtqkUla/NGVcJ/gAqcX0JMseuiGSeNVvDi0tMuUJJny3GM+9xK:+aCqc9rqzMseNoVv9EJFnM8xK
TLSH
T1FBE3270267F6C194F0B21A34CA3646F04B7ABC69FA70921B17847E4EBD31A15ED21777
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/864-9-0x0000000010000000-0x0000000010032000-memory.dmp

Download

memory/864-10-0x0000000010000000-0x0000000010032000-memory.dmp

Download

memory/1300-0-0x0000000000400000-0x0000000000423000-memory.dmp

Download

memory/1300-2-0x0000000000400000-0x0000000000423000-memory.dmp

Download

memory/5360-6-0x0000000000400000-0x0000000000423000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads