farfli | 4fc931fe01974bcdc15f18b4fbe3fc439eef1c9a9e2462e08222f2a684abdf16

General

Target
2026-05-22_07441615c40ccaa02fe4281f6ec0f9c7_elex_wannacry.exe
Size 115KB
Sample260522-219avaat8t
SHA256 4fc931fe01974bcdc15f18b4fbe3fc439eef1c9a9e2462e08222f2a684abdf16
MD5 07441615c40ccaa02fe4281f6ec0f9c7
SHA1 1b16ba920276f4276f2d948c1bf1a71a95a5dce9
SHA512 90168e5faeeabf49d7ee8970c746a2f14b041316656db26f7d8ed915d33b7d541b07a93f133efd38d83221bbe0069807c2e5aa664fbfb9d1984af5b787fa95e6
SSDEEP 1536:gWCfpn0RbXfmvElSdwS4ytneUDy9ZkM4A3FaJw/xfPWMywTM:gWmpn0RbXNxeeJ9w7EPWMywo
TLSH
T1B4C3C0136BAE44FAE0200D7505BA1B3543BA785A2B245777D384ED1EB872EC4EC3D35A
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery farfli gh0strat persistence rat spyware stealer

Malware Config

Extracted

Family

gh0strat

C2

host123.zz.am:6658
http://23.104.160.115:8890/version.php
http://23.104.160.116:9963/

Attributes

user_agent
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C))

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)

Signatures

Family: Farfli
Farfli is a Windows backdoor written in C++.
backdoor farfli
Family: Gh0strat
Gh0st RAT is a remote access tool (RAT) with its source code public and it has been used by multiple Chinese groups.
rat gh0strat

Detects Farfli Backdoor 3 IoCs

resource	yara_rule
behavioral1/memory/3328-10-0x0000000010000000-0x0000000010045000-memory.dmp	family_farfli
behavioral1/memory/3328-9-0x0000000010000000-0x0000000010045000-memory.dmp	family_farfli
behavioral1/memory/3328-11-0x0000000010000000-0x0000000010045000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 3 IoCs

resource	yara_rule
behavioral1/memory/3328-10-0x0000000010000000-0x0000000010045000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/3328-9-0x0000000010000000-0x0000000010045000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/3328-11-0x0000000010000000-0x0000000010045000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

Badlisted process makes network request 4 IoCs

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

flow	pid	Process
6	3328	rundll32.exe
33	3328	rundll32.exe
34	3328	rundll32.exe
57	3328	rundll32.exe

Executes dropped EXE 1 IoCs

pid	Process
4292	bjnhwk.exe

Loads dropped DLL 1 IoCs

pid	Process
3328	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-1-5-21-668679576-120646659-2289335452-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\EvtMgr = "c:\\windows\\SysWOW64\\rundll32.exe \"c:\\utbhm\\tohch.dll\",AbortProc"	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)	\??\l:	rundll32.exe
File opened (read-only)	\??\t:	rundll32.exe
File opened (read-only)	\??\v:	rundll32.exe
File opened (read-only)	\??\y:	rundll32.exe
File opened (read-only)	\??\b:	rundll32.exe
File opened (read-only)	\??\e:	rundll32.exe
File opened (read-only)	\??\m:	rundll32.exe
File opened (read-only)	\??\p:	rundll32.exe
File opened (read-only)	\??\q:	rundll32.exe
File opened (read-only)	\??\r:	rundll32.exe
File opened (read-only)	\??\s:	rundll32.exe
File opened (read-only)	\??\g:	rundll32.exe
File opened (read-only)	\??\h:	rundll32.exe
File opened (read-only)	\??\n:	rundll32.exe
File opened (read-only)	\??\o:	rundll32.exe
File opened (read-only)	\??\u:	rundll32.exe
File opened (read-only)	\??\w:	rundll32.exe
File opened (read-only)	\??\x:	rundll32.exe
File opened (read-only)	\??\j:	rundll32.exe
File opened (read-only)	\??\k:	rundll32.exe
File opened (read-only)	\??\z:	rundll32.exe
File opened (read-only)	\??\a:	rundll32.exe
File opened (read-only)	\??\i:	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	bjnhwk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-22_07441615c40ccaa02fe4281f6ec0f9c7_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

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
5068	cmd.exe
4540	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
4540	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3328	rundll32.exe
3328	rundll32.exe
3328	rundll32.exe
3328	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3328	rundll32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
548	2026-05-22_07441615c40ccaa02fe4281f6ec0f9c7_elex_wannacry.exe
4292	bjnhwk.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 548 wrote to memory of 5068	548	2026-05-22_07441615c40ccaa02fe4281f6ec0f9c7_elex_wannacry.exe	88
PID 5068 wrote to memory of 4540	5068	cmd.exe	90
PID 5068 wrote to memory of 4292	5068	cmd.exe	92
PID 4292 wrote to memory of 3328	4292	bjnhwk.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-05-22_07441615c40ccaa02fe4281f6ec0f9c7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-22_07441615c40ccaa02fe4281f6ec0f9c7_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:548
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&c:\bjnhwk.exe "C:\Users\Admin\AppData\Local\Temp\2026-05-22_07441615c40ccaa02fe4281f6ec0f9c7_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:5068
- - 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:4540
- - \??\c:\bjnhwk.exe
    c:\bjnhwk.exe "C:\Users\Admin\AppData\Local\Temp\2026-05-22_07441615c40ccaa02fe4281f6ec0f9c7_elex_wannacry.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4292
  - - \??\c:\windows\SysWOW64\rundll32.exe
      c:\windows\system32\rundll32.exe "c:\utbhm\tohch.dll",AbortProc c:\bjnhwk.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:3328

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Pre-OS Boot

1

T1542

Bootkit

1

T1542.003

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Peripheral Device Discovery

Query Registry

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

bjnhwk.exe

Path C:\bjnhwk.exe
Size 115KB
SHA256 c4a133c50a43d564c7742379eb739cd508138cf4798ff64923e1fcbe5bc8a327
MD5 6fc168c66c574ef464de282026e672e2
SHA1 b1397978d460b609c2f208559885fbafbfc0e675
SHA512 cf3fd7b38765186173529301c735826715a19af956170b263e950306892997c04b0e3631ca73ad6eced298b510ef1c3f42eadf20c1d0bb9da2d0386bad37e5a9
SSDEEP 1536:gWCfpn0RbXfmvElSdwS4ytneUDy9ZkM4A3FaJw/xfPWMywTE:gWmpn0RbXNxeeJ9w7EPWMywY
TLSH
T169C3C0136BAE44FAE0200D7505BA1B3543BA685A3B245777D384EE1EF872EC4EC3D256
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

tohch.dll

Path \??\c:\utbhm\tohch.dll
Size 60KB
SHA256 42304221991ff2ea9d6c0252d42b90390caebc312a17126a4b13e9514f2b7d87
MD5 75e08aa9274df390fcdb1df3d0733bd5
SHA1 f3053cc10f33436aa1da7ec82a12ffdaff10ccfb
SHA512 dee8a07ca2142eb2ec1a5ce56af92605bb1c11e89da5d4335aee1098dc73375e422d9c53f201e571ff64b51c5cfa3928b1f26c0a23f4671dfbd91b1355d0e9db
SSDEEP 1536:Itj4HbqT+M0L2J2US62eSBQno/CUVzsxeOPw:ItqeT+M02J25qnLUVzs9w
TLSH
T1D05301286F6D2EDDFA3152B1E0985093FBD98B03043FA24D2544777F7D829631A93BA4
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3328-7-0x0000000010000000-0x0000000010045000-memory.dmp

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memory/3328-10-0x0000000010000000-0x0000000010045000-memory.dmp

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memory/3328-9-0x0000000010000000-0x0000000010045000-memory.dmp

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memory/3328-8-0x0000000000890000-0x0000000000891000-memory.dmp

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memory/3328-11-0x0000000010000000-0x0000000010045000-memory.dmp

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memory/3328-12-0x0000000000890000-0x0000000000891000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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