farfli | 6d9c9abc5be67c8671eb15b1381688b13de1ca62918485a429e76101b269e255

Analysis

max time kernel
148s
max time network
138s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
03/08/2026, 08:42

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General

Target
2026-08-03_f6fe2153ac68fc085b8a733adc51e600_coinminer_elex_wannacry.exe
Size 296KB
Sample260803-kl32vaeh22
SHA256 6d9c9abc5be67c8671eb15b1381688b13de1ca62918485a429e76101b269e255
MD5 f6fe2153ac68fc085b8a733adc51e600
SHA1 807cbad091f054437a63ef1230dfc0f2b09f97ba
SHA512 fb86708ded67aa2cc87176f502dbe54d6464f387cd38cce8cfcd3de08cb05fc88fb61b87f89abcb2603a26b488c1fe9beadce8492586e00dc347d5e341937cb6
SSDEEP 6144:glYAIeOcaxmlJaErfbMCurC7xS3ZMOBnskyrO:ywLcCmuErglr73aAD+
TLSH
T13C540282E502DF07EC3FC7B6813E5E291217AF521B705593D3C4B91E66B3682B63A0D9
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 7 IoCs

resource	yara_rule
behavioral2/memory/5888-12-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/5888-10-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/5888-15-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/5888-17-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/5888-18-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/5888-19-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/5888-20-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 7 IoCs

resource	yara_rule
behavioral2/memory/5888-12-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/5888-10-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/5888-15-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/5888-17-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/5888-18-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/5888-19-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/5888-20-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/2956-0-0x0000000000400000-0x0000000000483000-memory.dmp	UPX
behavioral2/memory/2956-2-0x0000000000400000-0x0000000000483000-memory.dmp	UPX
behavioral2/files/0x000c00000001b87d-3.dat	UPX
behavioral2/memory/4144-6-0x0000000000400000-0x0000000000483000-memory.dmp	UPX

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
4	5888	rundll32.exe
8	5888	rundll32.exe
9	5888	rundll32.exe
10	5888	rundll32.exe
11	5888	rundll32.exe
12	5888	rundll32.exe
14	5888	rundll32.exe
15	5888	rundll32.exe

Deletes itself 1 IoCs

pid	Process
4144	crfgu.exe

Executes dropped EXE 1 IoCs

pid	Process
4144	crfgu.exe

Loads dropped DLL 1 IoCs

pid	Process
5888	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-1-5-21-3797332335-34111092-3597280141-1000\Software\Microsoft\Windows\CurrentVersion\Run\Wetor = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\ypbicoosl\\tzaukoya.dll\",GetProc"	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)	\??\o:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\q:	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)	\??\b:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\n:	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/2956-0-0x0000000000400000-0x0000000000483000-memory.dmp	upx
behavioral2/memory/2956-2-0x0000000000400000-0x0000000000483000-memory.dmp	upx
behavioral2/files/0x000c00000001b87d-3.dat	upx
behavioral2/memory/4144-6-0x0000000000400000-0x0000000000483000-memory.dmp	upx

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\ypbicoosl	crfgu.exe
File created	\??\c:\Program Files\ypbicoosl\tzaukoya.dll	crfgu.exe

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
3476	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	2026-08-03_f6fe2153ac68fc085b8a733adc51e600_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	crfgu.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
3476	cmd.exe
5856	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
5856	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
5888	rundll32.exe
5888	rundll32.exe
5888	rundll32.exe
5888	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5888	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2956	2026-08-03_f6fe2153ac68fc085b8a733adc51e600_coinminer_elex_wannacry.exe
4144	crfgu.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2956 wrote to memory of 3476	2956	2026-08-03_f6fe2153ac68fc085b8a733adc51e600_coinminer_elex_wannacry.exe	89
PID 3476 wrote to memory of 5856	3476	cmd.exe	91
PID 3476 wrote to memory of 4144	3476	cmd.exe	92
PID 4144 wrote to memory of 5888	4144	crfgu.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-03_f6fe2153ac68fc085b8a733adc51e600_coinminer_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_f6fe2153ac68fc085b8a733adc51e600_coinminer_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2956
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\crfgu.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-03_f6fe2153ac68fc085b8a733adc51e600_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:3476
- - 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:5856
- - C:\Users\Admin\AppData\Local\Temp\crfgu.exe
    C:\Users\Admin\AppData\Local\Temp\\crfgu.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-03_f6fe2153ac68fc085b8a733adc51e600_coinminer_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - Drops file in Program Files directory
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4144
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\ypbicoosl\tzaukoya.dll",GetProc C:\Users\Admin\AppData\Local\Temp\crfgu.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:5888

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Command Shell

T1059.003

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

crfgu.exe

Path C:\Users\Admin\AppData\Local\Temp\crfgu.exe
Size 296KB
SHA256 208a5ea865e8d702a01e4b91a666c934a1126ef94db175d12f2f8aa0231117c7
MD5 b7b734f9484fe52ef6ef77ceee3046dc
SHA1 ca77ac8b48846dde1d23b2a6e324fc70299a89b2
SHA512 6e7ba786379d5455cb41dc06cc78aba2c6278a4e10ef009329fb9a1506063f47067f1a57af738ea8279a95331dc76c308282d148a1455aed4cfa464f001c70fd
SSDEEP 6144:glYAIeOcaxmlJaErfbMCurC7xS3ZMOBnskyrOG:ywLcCmuErglr73aAD+t
TLSH
T1F7540282E501CF47EC2FC7B6813E5E291217AF522B705593D3C4B91E66B3682B63E0D9
MD5 SHA1 SHA512 SSDEEP TLSH

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tzaukoya.dll

Path \??\c:\Program Files\ypbicoosl\tzaukoya.dll
Size 218KB
SHA256 8e93368f6e818169dbd1e16bce0d7d58829b4030c6d169c8753065a068cd6c1f
MD5 d0acac44f46131a2f01e993060772fb7
SHA1 fdef82e081e3edd5e31fbd00139473a7678674de
SHA512 f1c3a4e755dd9f8fc750abe10753cd6ce283fa1aeae4a4301bdf0584242f609108e3c293baaea0a3977636df06edb97f0e5c23412733f11a1839358136ab7dd1
SSDEEP 6144:KORxNwD2VOidhzeXwddDzLi5vOQEqscr0ZTJauytk:pnNwDTi3swddDiROXIe
TLSH
T1F824128BCF983873C5223379597951A0B9724290AFA1534D92E6D34FA072BA2CF7B531
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/2956-0-0x0000000000400000-0x0000000000483000-memory.dmp

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memory/2956-2-0x0000000000400000-0x0000000000483000-memory.dmp

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memory/4144-6-0x0000000000400000-0x0000000000483000-memory.dmp

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memory/5888-10-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/5888-12-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/5888-9-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/5888-14-0x0000000002BF0000-0x0000000002BF1000-memory.dmp

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memory/5888-15-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/5888-17-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/5888-18-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/5888-19-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/5888-20-0x0000000010000000-0x0000000010058000-memory.dmp

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