farfli | 9980b21484cfba8d42487c7d7ce1eae72ef9167ff064942537db6c52f7ec3882

Analysis

max time kernel
149s
max time network
135s
platform
windows10-2004_x64
resource
win10v2004-20260911-en
resource tags

arch:x64arch:x86image:win10v2004-20260911-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
11/11/2026, 22:48

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General

Target
2026-11-10_b1eea65de7c1e01e2001836b79cdfb2a_elex_wannacry.exe
Size 391KB
Sample261111-2q4ydacd89
SHA256 9980b21484cfba8d42487c7d7ce1eae72ef9167ff064942537db6c52f7ec3882
MD5 b1eea65de7c1e01e2001836b79cdfb2a
SHA1 d14874ac5c3a3030e0448fa18ac87595af7d3622
SHA512 95f507c5429bb255f715da9a3ef4790aa2b2e94bfb36d119bd8bc00d93b18e09bd5ddd04f3370a4e189b97f6428aa1b1445a5049e13aa136f9167ceaa60725f4
SSDEEP 6144:54yA9i7ZanCjRDWqCEdK40LUT4AxFa7abls3oO:i7i1TjRDdZdVT4AxFauba3x
TLSH
T1CA847AC057F9C205F2BE2F75DAB976F04A29BD55EE34E64B12843C1DB870A91D870326
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit defense_evasion discovery execution farfli persistence spyware stealer

Malware Config

Signatures

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

Detects Farfli Backdoor 2 IoCs

resource	yara_rule
behavioral1/memory/1752-12-0x0000000010000000-0x0000000010054000-memory.dmp	family_farfli
behavioral1/memory/1752-14-0x0000000010000000-0x0000000010054000-memory.dmp	family_farfli

Custom signature

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral1/memory/1752-12-0x0000000010000000-0x0000000010054000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/1752-14-0x0000000010000000-0x0000000010054000-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
6	1752	rundll32.exe
15	1752	rundll32.exe
16	1752	rundll32.exe
17	1752	rundll32.exe
30	1752	rundll32.exe
31	1752	rundll32.exe
34	1752	rundll32.exe
41	1752	rundll32.exe

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
4744	ybjsb.exe

Executes dropped EXE 1 IoCs

pid	Process
4744	ybjsb.exe

Loads dropped DLL 1 IoCs

pid	Process
1752	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-1-5-21-2101206053-1414382737-268919432-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\HDTunePro = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\Program Files\\fuwuk\\oymcitja.dll\",GetCpu"	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)	\??\e:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\x:	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)	\??\r:	rundll32.exe
File opened (read-only)	\??\w:	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)	\??\p:	rundll32.exe
File opened (read-only)	\??\y:	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

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	\??\c:\Program Files\fuwuk	ybjsb.exe
File created	\??\c:\Program Files\fuwuk\oymcitja.dll	ybjsb.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
1200	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	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-11-10_b1eea65de7c1e01e2001836b79cdfb2a_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	ybjsb.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
1200	cmd.exe
2328	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
2328	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1752	rundll32.exe
1752	rundll32.exe
1752	rundll32.exe
1752	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1752	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1748	2026-11-10_b1eea65de7c1e01e2001836b79cdfb2a_elex_wannacry.exe
4744	ybjsb.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1748 wrote to memory of 1200	1748	2026-11-10_b1eea65de7c1e01e2001836b79cdfb2a_elex_wannacry.exe	84
PID 1200 wrote to memory of 2328	1200	cmd.exe	86
PID 1200 wrote to memory of 4744	1200	cmd.exe	89
PID 4744 wrote to memory of 1752	4744	ybjsb.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-11-10_b1eea65de7c1e01e2001836b79cdfb2a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-10_b1eea65de7c1e01e2001836b79cdfb2a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1748
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\ybjsb.exe "C:\Users\Admin\AppData\Local\Temp\2026-11-10_b1eea65de7c1e01e2001836b79cdfb2a_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:1200
- - 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:2328
- - C:\Users\Admin\AppData\Local\Temp\ybjsb.exe
    C:\Users\Admin\AppData\Local\Temp\\ybjsb.exe "C:\Users\Admin\AppData\Local\Temp\2026-11-10_b1eea65de7c1e01e2001836b79cdfb2a_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:4744
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\Program Files\fuwuk\oymcitja.dll",GetCpu C:\Users\Admin\AppData\Local\Temp\ybjsb.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:1752

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

Indicator Removal

T1070

File Deletion

T1070.004

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

ybjsb.exe

Path C:\Users\Admin\AppData\Local\Temp\ybjsb.exe
Size 391KB
SHA256 75cb1d851dd65180076d9257eca9485c03aabe7f3136d27513be92031721bebc
MD5 fc6f8796fdf4a21be77a0bd4692b4742
SHA1 a602cbd630d0b94984b8fbd061d9bef549c90625
SHA512 2c64653518ab0f144827a0f2796691ca84024fbc204f827387eb96d7c7e2abb8c03aa73aca94cb8ce96db1254183fea666e80f48da24fb36a7a97bfbf9c5c3b2
SSDEEP 6144:54yA9i7ZanCjRDWqCEdK40LUT4AxFa7abls3oj:i7i1TjRDdZdVT4AxFauba3S
TLSH
T1A2847AC057F9C205F2BE2F75DAB976F04A29BD55EE34E64B12843C1DB870A91D870326
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

oymcitja.dll

Path \??\c:\Program Files\fuwuk\oymcitja.dll
Size 144KB
SHA256 e19c6e0580a0766442e70ce72352194ec5adba4d92cfbb7ece0072c3a84d2b2e
MD5 f28ebc9fe3a13cfaff898a41cf178627
SHA1 023352e6c7be2246eb3e39a94bfe1ea3f7cf42c2
SHA512 e737e3b619ea6958ccbc0c013a63f55872708c84c9f8efbac54b1eef0599d65e6d92ded8a1e2d58d7f0aa6d455bb9250361b05aea2f5c2f9960317cd01a8a677
SSDEEP 3072:9FSwhKDdKtTZVdOEaoxVDYn10zGJP4eLhSco/fWoB7re9Z9Idl8v4qClISj:awhKDaZfFTxV8nXgesN/OpLcl8v4qwI0
TLSH
T134E302E2215AD2B3F4BE177D9C57050EF9BD14009BB98A5B57C0781A2C1AA36E83D373
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1748-0-0x0000000000400000-0x0000000000461000-memory.dmp

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memory/1748-2-0x0000000000400000-0x0000000000461000-memory.dmp

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memory/1752-10-0x0000000010000000-0x0000000010054000-memory.dmp

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memory/1752-11-0x000000001004E000-0x000000001004F000-memory.dmp

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memory/1752-12-0x0000000010000000-0x0000000010054000-memory.dmp

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memory/1752-14-0x0000000010000000-0x0000000010054000-memory.dmp

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memory/4744-7-0x0000000000400000-0x0000000000461000-memory.dmp

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