farfli | edcae1c77c5e92bceaf4a20baf24e11ae4e4ac2f64de196085f66ad63eb90c58

Analysis

max time kernel
149s
max time network
151s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
05/05/2026, 04:04

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General

Target
2026-05-05_8d0b9634483c9fc4e5ca38368e5d83e1_elex_wannacry.exe
Size 102KB
Sample260505-endbbab16l
SHA256 edcae1c77c5e92bceaf4a20baf24e11ae4e4ac2f64de196085f66ad63eb90c58
MD5 8d0b9634483c9fc4e5ca38368e5d83e1
SHA1 49f085de73e4a4c448f92d31725fb3595c1c2417
SHA512 aa288bd35bbc459558bf96c5730bd5e0d167568b97774ceaad678182b3112bc5c543e2dbd94f22b7e7644cac2640bf77ac4b3fb9410ef35777c7630cf79374be
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX48:piAXaKDeKNnD36cb8tI8
TLSH
T12DA39D42ABF08661E0619DB506735B629EB3FC2B193483677BD6B70EAC34F40EE21355
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 4 IoCs

resource	yara_rule
behavioral2/memory/968-12-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/968-13-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli
behavioral2/memory/968-14-0x0000000010000000-0x000000001002E000-memory.dmp	family_farfli
behavioral2/memory/968-16-0x0000000010001000-0x000000001001E000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral2/memory/968-12-0x0000000010000000-0x000000001002E000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral2/memory/968-14-0x0000000010000000-0x000000001002E000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Badlisted process makes network request 15 IoCs

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

flow	pid	Process
1	968	rundll32.exe
2	968	rundll32.exe
3	968	rundll32.exe
4	968	rundll32.exe
5	968	rundll32.exe
6	968	rundll32.exe
7	968	rundll32.exe
8	968	rundll32.exe
9	968	rundll32.exe
10	968	rundll32.exe
13	968	rundll32.exe
14	968	rundll32.exe
16	968	rundll32.exe
17	968	rundll32.exe
18	968	rundll32.exe

Deletes itself 1 IoCs

pid	Process
3652	ycvsdbwul.exe

Executes dropped EXE 1 IoCs

pid	Process
3652	ycvsdbwul.exe

Loads dropped DLL 1 IoCs

pid	Process
968	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-1-5-21-3119821332-640943685-2562343641-1000\Software\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\tjbkn\\cgunly.dll\",GetWindowClass"	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)	\??\q:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\l:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\z:	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)	\??\m:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\p:	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	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-05_8d0b9634483c9fc4e5ca38368e5d83e1_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	ycvsdbwul.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
2832	cmd.exe
2196	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
2196	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	968	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
3504	2026-05-05_8d0b9634483c9fc4e5ca38368e5d83e1_elex_wannacry.exe
3652	ycvsdbwul.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3504 wrote to memory of 2832	3504	2026-05-05_8d0b9634483c9fc4e5ca38368e5d83e1_elex_wannacry.exe	79
PID 2832 wrote to memory of 2196	2832	cmd.exe	81
PID 2832 wrote to memory of 3652	2832	cmd.exe	82
PID 3652 wrote to memory of 968	3652	ycvsdbwul.exe	83

C:\Users\Admin\AppData\Local\Temp\2026-05-05_8d0b9634483c9fc4e5ca38368e5d83e1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-05_8d0b9634483c9fc4e5ca38368e5d83e1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3504
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\ycvsdbwul.exe "C:\Users\Admin\AppData\Local\Temp\2026-05-05_8d0b9634483c9fc4e5ca38368e5d83e1_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:2832
- - 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:2196
- - \??\c:\ycvsdbwul.exe
    c:\ycvsdbwul.exe "C:\Users\Admin\AppData\Local\Temp\2026-05-05_8d0b9634483c9fc4e5ca38368e5d83e1_elex_wannacry.exe"
    3⤵
    - Deletes itself
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3652
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\tjbkn\cgunly.dll",GetWindowClass c:\ycvsdbwul.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:968

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

cgunly.dll

Path C:\tjbkn\cgunly.dll
Size 46KB
SHA256 f57f9e54f4774c2b944fb070ae0c2a02cbb4b7686ab3207544c3ccaff0ff3dd9
MD5 a3fd41430ddcaa55fde840788925406a
SHA1 dbdd87f5c1bbf6a6f44c2e2c4744675d5e4e75c2
SHA512 23109572cfc9a282ea3ec84d93bfe02303d27f365ad2d9f47f6234f91da14c64f80133cc5e49746dfcb65d2454b7e7c13eff59ba4bbc18e09d2fb1c630ba59c9
SSDEEP 768:2sUfnvxs6iLlhpfFPtnQf7kifD/v7yb9Bh7Cb0VQJojZC/xjTk:2sJT1qf4W/vub9nnV1jZC/xE
TLSH
T19D2302C8A6F08EF3D2F90B7980E046DCDCFDB939877381150566008E7C71057FA446AA
MD5 SHA1 SHA512 SSDEEP TLSH

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ycvsdbwul.exe

Path C:\ycvsdbwul.exe
Size 102KB
SHA256 e4038263f52005c205ba0be7cb680df92ee38a24627a738a743dd7f978a5154d
MD5 ad543d2af1c5a01de8bfc3211645327e
SHA1 cd8f06efdfd70e67c31dcff3e5f12f44d0bcce5a
SHA512 60da5bb7b76e1f24c6f8e3a7e9a2e3905f40422be35142e4ee1ab57c52b53a4339809a84c6c1ed6968878ee7dff25bc74fb8c8cc8c07dc98cf0a1f844a4edf15
SSDEEP 1536:vRiAXaKD5gxzmwYEM/D3ozc4I8JboecWtX48w:piAXaKDeKNnD36cb8tI8w
TLSH
T11EA39D42ABF08661E06199B506735B629EB3FC2B193483677BD6B70EAC34F40EE21355
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/968-15-0x0000000001650000-0x0000000001762000-memory.dmp

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memory/968-12-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/968-13-0x0000000010001000-0x000000001001E000-memory.dmp

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memory/968-14-0x0000000010000000-0x000000001002E000-memory.dmp

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memory/968-16-0x0000000010001000-0x000000001001E000-memory.dmp

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memory/968-19-0x0000000001650000-0x0000000001762000-memory.dmp

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memory/968-29-0x0000000001650000-0x0000000001762000-memory.dmp

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memory/968-30-0x0000000001650000-0x0000000001762000-memory.dmp

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memory/3504-0-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/3504-3-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/3504-2-0x0000000000980000-0x0000000000A92000-memory.dmp

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memory/3652-9-0x0000000000400000-0x000000000041A000-memory.dmp

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memory/3652-8-0x00000000009E0000-0x0000000000A9B000-memory.dmp

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