farfli | f3cd5e7deb00a1be2011aa4e9ff908d002b7102afbe5ecf329ffb220fa0bcbd3

Analysis

max time kernel
150s
max time network
137s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
04/08/2026, 16:05

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General

Target
2026-08-04_3ed33948697c45e5bd26d270e2880424_coinminer_elex_wannacry.exe
Size 311KB
Sample260804-tjvgcsssbz
SHA256 f3cd5e7deb00a1be2011aa4e9ff908d002b7102afbe5ecf329ffb220fa0bcbd3
MD5 3ed33948697c45e5bd26d270e2880424
SHA1 a0767987ee8ebc12b1efcd1053b3e8b7c97799e3
SHA512 fdbb35515b3a0fb040562c9ed30164354e783c9b87dfbb0a42820c99a3d9502275c35a9b53f7f4036563489cb6b6360553dbc3e9181ed765a5d6c9dfa83e314b
SSDEEP 6144:glYAIeOcaxmlJaErfbMCurC7xS3ZMOBnskyrO:ywLcCmuErglr73aAD+
TLSH
T1CD64F141D511CF47FC2FCAB6823E1E355317AE553B205693D3C8BA1F65B2B42A63A0D8
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/4232-11-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/4232-13-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/4232-15-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/4232-18-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/4232-19-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/4232-20-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli
behavioral2/memory/4232-21-0x0000000010000000-0x0000000010058000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 7 IoCs

resource	yara_rule
behavioral2/memory/4232-11-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4232-13-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4232-15-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4232-18-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4232-19-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4232-20-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4232-21-0x0000000010000000-0x0000000010058000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/5684-0-0x0000000000400000-0x0000000000483000-memory.dmp	UPX
behavioral2/memory/5684-2-0x0000000000400000-0x0000000000483000-memory.dmp	UPX
behavioral2/files/0x000b00000001b315-3.dat	UPX
behavioral2/memory/4488-6-0x0000000000400000-0x0000000000483000-memory.dmp	UPX

Badlisted process makes network request 8 IoCs

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

flow	pid	Process
6	4232	rundll32.exe
9	4232	rundll32.exe
10	4232	rundll32.exe
11	4232	rundll32.exe
12	4232	rundll32.exe
13	4232	rundll32.exe
16	4232	rundll32.exe
18	4232	rundll32.exe

Deletes itself 1 IoCs

pid	Process
4488	iydfz.exe

Executes dropped EXE 1 IoCs

pid	Process
4488	iydfz.exe

Loads dropped DLL 1 IoCs

pid	Process
4232	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-1-5-21-1875162379-3804078649-638427191-1000\Software\Microsoft\Windows\CurrentVersion\Run\Wetor = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\bdryij\\yzluh.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)	\??\b:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\d:	rundll32.exe
File opened (read-only)	\??\g:	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)	\??\y:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\r:	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/5684-0-0x0000000000400000-0x0000000000483000-memory.dmp	upx
behavioral2/memory/5684-2-0x0000000000400000-0x0000000000483000-memory.dmp	upx
behavioral2/files/0x000b00000001b315-3.dat	upx
behavioral2/memory/4488-6-0x0000000000400000-0x0000000000483000-memory.dmp	upx

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\bdryij	iydfz.exe
File created	\??\c:\Program Files\bdryij\yzluh.dll	iydfz.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
2944	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	2026-08-04_3ed33948697c45e5bd26d270e2880424_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	iydfz.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
2944	cmd.exe
1360	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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	rundll32.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	rundll32.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1360	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4232	rundll32.exe
4232	rundll32.exe
4232	rundll32.exe
4232	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4232	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
5684	2026-08-04_3ed33948697c45e5bd26d270e2880424_coinminer_elex_wannacry.exe
4488	iydfz.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 5684 wrote to memory of 2944	5684	2026-08-04_3ed33948697c45e5bd26d270e2880424_coinminer_elex_wannacry.exe	89
PID 2944 wrote to memory of 1360	2944	cmd.exe	91
PID 2944 wrote to memory of 4488	2944	cmd.exe	92
PID 4488 wrote to memory of 4232	4488	iydfz.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-04_3ed33948697c45e5bd26d270e2880424_coinminer_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_3ed33948697c45e5bd26d270e2880424_coinminer_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5684
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\iydfz.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-04_3ed33948697c45e5bd26d270e2880424_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:2944
- - 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:1360
- - C:\Users\Admin\AppData\Local\Temp\iydfz.exe
    C:\Users\Admin\AppData\Local\Temp\\iydfz.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-04_3ed33948697c45e5bd26d270e2880424_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:4488
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\bdryij\yzluh.dll",GetProc C:\Users\Admin\AppData\Local\Temp\iydfz.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:4232

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

iydfz.exe

Path C:\Users\Admin\AppData\Local\Temp\iydfz.exe
Size 312KB
SHA256 f47779e68128a97aaa0d294c9e370a83e3fa508e227b8ba4f559575f5cb5dc39
MD5 7ee213406ac819e5765bfa02f1a4f3ec
SHA1 1a157bc759ad20f11f5b6d946c74856d0b305508
SHA512 1f61aeaa95d4a4f64cd2bcfa5cbb8b40a134af81309ac55c8b24e57fd6521d7c0b5a65e002b1d41b02a7078608389ca9e2915fc2dd636a64725f139e2655e862
SSDEEP 6144:glYAIeOcaxmlJaErfbMCurC7xS3ZMOBnskyrO:ywLcCmuErglr73aAD+
TLSH
T14964F141D511CF47FC2FCAB6823E1E355317AE553B2056A3D3C8BA1F65B2B42A63A0D8
MD5 SHA1 SHA512 SSDEEP TLSH

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yzluh.dll

Path \??\c:\Program Files\bdryij\yzluh.dll
Size 218KB
SHA256 666ebe2563c96a2c9e57eddb394282b9c83b7637208403d51af6add1baff052d
MD5 4c6b8dea5cf250bea726cb269b241bc4
SHA1 952016b99009d683eb24d013a0dff488e150bfb8
SHA512 da399506cbade283f537af8543c6b4e72ca48642e7b2ff7402096b80d936c716fe5216b2664aca89c608a451729c295c3798bd3a4a0e2e1b1960d1757f27ac50
SSDEEP 6144:KORxNwD2VOidhzeXwddDzLi5vOQEqscr0ZTJauytJ:pnNwDTi3swddDiROXIn
TLSH
T14C24124BCF983873C5223379597951A0B9325290AFA1534DD2E6D34FA072BA2CF7B531
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/4232-15-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/4232-9-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/4232-10-0x0000000002590000-0x0000000002591000-memory.dmp

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memory/4232-11-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/4232-13-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/4232-16-0x0000000002590000-0x0000000002591000-memory.dmp

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memory/4232-18-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/4232-19-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/4232-20-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/4232-21-0x0000000010000000-0x0000000010058000-memory.dmp

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memory/4488-6-0x0000000000400000-0x0000000000483000-memory.dmp

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memory/5684-2-0x0000000000400000-0x0000000000483000-memory.dmp

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memory/5684-0-0x0000000000400000-0x0000000000483000-memory.dmp

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