farfli | 1f6f9ef5707580f1d41a88eda948f05a6d8796b2c3a6472935497feab8faa436

Analysis

max time kernel
148s
max time network
147s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
11/08/2026, 02:35

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General

Target
2026-08-11_aeb810fbd53e0a12c7353f3f5bd87937_elex_wannacry.exe
Size 154KB
Sample260811-c233saca34
SHA256 1f6f9ef5707580f1d41a88eda948f05a6d8796b2c3a6472935497feab8faa436
MD5 aeb810fbd53e0a12c7353f3f5bd87937
SHA1 0b41ee2b2ef06966f5256895357e1c2928da0220
SHA512 7cb96b314703d80f6b89b4f3dbd7d039a852c1b4ff4856eedc6b9729ee76b1f81c9b7dd736ba63658a4f3f99c57a853fce75947cb3fae749d634fdeda4ec5a61
SSDEEP 3072:mK4RNx65b4RoIwZpx10ZENfrGSQ7sDU/ySkNAq:ml65xiZuKoDkySkNA
TLSH
T139F3D0CE1F7ACFDBE1202C75D1A416F742529C98EB2457978385FD8EB832C81AC36126
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery execution farfli persistence spyware stealer

Malware Config

Signatures

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

Detects Farfli Backdoor 3 IoCs

resource	yara_rule
behavioral2/memory/4180-10-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/4180-9-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/4180-12-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral2/memory/4180-10-0x0000000010000000-0x000000001002E000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4180-9-0x0000000010000000-0x000000001002E000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/4180-12-0x0000000010000000-0x000000001002E000-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
4	4180	rundll32.exe
5	4180	rundll32.exe
6	4180	rundll32.exe
11	4180	rundll32.exe
12	4180	rundll32.exe
16	4180	rundll32.exe
17	4180	rundll32.exe
18	4180	rundll32.exe

Deletes itself 1 IoCs

pid	Process
4380	gbfltwtg.exe

Executes dropped EXE 1 IoCs

pid	Process
4380	gbfltwtg.exe

Loads dropped DLL 1 IoCs

pid	Process
4180	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-1-5-21-552508041-2681165170-3229858294-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\idxkzt\\kalpo.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)	\??\d:	rundll32.exe
File opened (read-only)	\??\i:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\w:	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

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
4700	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	2026-08-11_aeb810fbd53e0a12c7353f3f5bd87937_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	gbfltwtg.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
4700	cmd.exe
3520	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
3520	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4180	rundll32.exe
4180	rundll32.exe
4180	rundll32.exe
4180	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4180	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2560	2026-08-11_aeb810fbd53e0a12c7353f3f5bd87937_elex_wannacry.exe
4380	gbfltwtg.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2560 wrote to memory of 4700	2560	2026-08-11_aeb810fbd53e0a12c7353f3f5bd87937_elex_wannacry.exe	89
PID 4700 wrote to memory of 3520	4700	cmd.exe	91
PID 4700 wrote to memory of 4380	4700	cmd.exe	92
PID 4380 wrote to memory of 4180	4380	gbfltwtg.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-11_aeb810fbd53e0a12c7353f3f5bd87937_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-11_aeb810fbd53e0a12c7353f3f5bd87937_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2560
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\gbfltwtg.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-11_aeb810fbd53e0a12c7353f3f5bd87937_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:4700
- - 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:3520
- - \??\c:\gbfltwtg.exe
    c:\gbfltwtg.exe "C:\Users\Admin\AppData\Local\Temp\2026-08-11_aeb810fbd53e0a12c7353f3f5bd87937_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4380
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\idxkzt\kalpo.dll",init c:\gbfltwtg.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:4180

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

gbfltwtg.exe

Path \??\c:\gbfltwtg.exe
Size 155KB
SHA256 f42625f9b19a1a3d31af85c49e776cde938405c0a4ab8d4768b0d3d397c25419
MD5 adbd5bf6dd49fef98d43c45c0c59a0cf
SHA1 3cf8bd1a1c868993044fac2c1eb5d3bc6d28d690
SHA512 5cdca53c8d5302528c12ec8dea87447171c4dcd2b093b3068e9341252dc437516539361109c24f91471c8ac791bfb64e2ad96405e3bf18fd08ab32091cf24694
SSDEEP 3072:mK4RNx65b4RoIwZpx10ZENfrGSQ7sDU/ySkNAq5:ml65xiZuKoDkySkNAu
TLSH
T109F3D0CE1F7ACFDBE1202C75D1A416F782529C98EB1457978385FD8EB832D81AC36126
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

kalpo.dll

Path \??\c:\idxkzt\kalpo.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/2560-0-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/2560-2-0x0000000000400000-0x0000000000426000-memory.dmp

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memory/4180-10-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4180-11-0x00000000013B0000-0x00000000013B1000-memory.dmp

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memory/4180-9-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4180-13-0x00000000013B0000-0x00000000013B1000-memory.dmp

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memory/4180-12-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/4380-6-0x0000000000400000-0x0000000000426000-memory.dmp

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