farfli | b4ff31f5e7e0cf03ae5a97c4e52d1d448ddd2a532912b0cba9479567ddf08c68

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20260130-en
resource tags

arch:x64arch:x86image:win10v2004-20260130-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
18/04/2026, 10:32

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General

Target
2026-04-18_38f3c84d03e6d224a73ee1b8cc239c6e_coinminer_elex_wannacry.exe
Size 294KB
Sample260418-mk8baacz2x
SHA256 b4ff31f5e7e0cf03ae5a97c4e52d1d448ddd2a532912b0cba9479567ddf08c68
MD5 38f3c84d03e6d224a73ee1b8cc239c6e
SHA1 5c9e638a72b0423c7fe42ce5dbbec155f3f8eadb
SHA512 a073bd88b92bd1ce569899409f424fc591e3cf82dd1af1033a270bbcbac34192721ea8136f3e35c196967a35975551a4fd5e0a11152f15b66f729a8f4da4486f
SSDEEP 3072:qtaoOzbY5l/Tx1DUDcbouGYefD5h1zZCBgb3EInA3rdCKA9bwpfMrgsAHuskkycc:qtatPE5Txvev1zQBgexOdw6rpI9Fs29o
TLSH
T155547C1233E44869E4EA3A72CE76A630D7F6EC75AC33D67B03D4430E5A36A04CB55366
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

backdoor bootkit discovery farfli persistence spyware stealer upx

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/3836-15-0x0000000010000000-0x0000000010038000-memory.dmp	family_farfli
behavioral1/memory/3836-22-0x0000000010000000-0x0000000010038000-memory.dmp	family_farfli

Detects executables containing base64 encoded User Agent 2 IoCs

resource	yara_rule
behavioral1/memory/3836-15-0x0000000010000000-0x0000000010038000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent
behavioral1/memory/3836-22-0x0000000010000000-0x0000000010038000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_B64_Encoded_UserAgent

UPX dump on OEP (original entry point) 8 IoCs

resource	yara_rule
behavioral1/memory/1224-0-0x0000000000400000-0x000000000043F000-memory.dmp	UPX
behavioral1/memory/1224-2-0x0000000000400000-0x000000000043F000-memory.dmp	UPX
behavioral1/files/0x0008000000024421-4.dat	UPX
behavioral1/memory/1116-10-0x0000000000400000-0x000000000043F000-memory.dmp	UPX
behavioral1/files/0x0008000000024427-11.dat	UPX
behavioral1/memory/3836-14-0x0000000010000000-0x0000000010038000-memory.dmp	UPX
behavioral1/memory/3836-15-0x0000000010000000-0x0000000010038000-memory.dmp	UPX
behavioral1/memory/3836-22-0x0000000010000000-0x0000000010038000-memory.dmp	UPX

Deletes itself 1 IoCs

pid	Process
1116	mrmck.exe

Executes dropped EXE 2 IoCs

pid	Process
1116	mrmck.exe
3836	emx.exe

Loads dropped DLL 1 IoCs

pid	Process
3836	emx.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-1-5-21-312252282-3884318443-358092420-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Vicity = "c:\\Program Files\\flzuur\\emx.exe \"c:\\Program Files\\flzuur\\emxzq.dll\",Group"	emx.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)	\??\x:	emx.exe
File opened (read-only)	\??\l:	emx.exe
File opened (read-only)	\??\o:	emx.exe
File opened (read-only)	\??\v:	emx.exe
File opened (read-only)	\??\y:	emx.exe
File opened (read-only)	\??\z:	emx.exe
File opened (read-only)	\??\q:	emx.exe
File opened (read-only)	\??\b:	emx.exe
File opened (read-only)	\??\g:	emx.exe
File opened (read-only)	\??\r:	emx.exe
File opened (read-only)	\??\s:	emx.exe
File opened (read-only)	\??\a:	emx.exe
File opened (read-only)	\??\j:	emx.exe
File opened (read-only)	\??\m:	emx.exe
File opened (read-only)	\??\t:	emx.exe
File opened (read-only)	\??\u:	emx.exe
File opened (read-only)	\??\e:	emx.exe
File opened (read-only)	\??\h:	emx.exe
File opened (read-only)	\??\i:	emx.exe
File opened (read-only)	\??\k:	emx.exe
File opened (read-only)	\??\n:	emx.exe
File opened (read-only)	\??\p:	emx.exe
File opened (read-only)	\??\w:	emx.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	emx.exe

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/files/0x0008000000024427-11.dat	upx
behavioral1/memory/3836-14-0x0000000010000000-0x0000000010038000-memory.dmp	upx
behavioral1/memory/3836-15-0x0000000010000000-0x0000000010038000-memory.dmp	upx
behavioral1/memory/3836-22-0x0000000010000000-0x0000000010038000-memory.dmp	upx

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	\??\c:\Program Files\flzuur\emxzq.dll	mrmck.exe
File created	\??\c:\Program Files\flzuur\emx.exe	mrmck.exe
File opened for modification	\??\c:\Program Files\flzuur\emx.exe	mrmck.exe
File opened for modification	\??\c:\Program Files\flzuur	mrmck.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	2026-04-18_38f3c84d03e6d224a73ee1b8cc239c6e_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	mrmck.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	emx.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
3480	cmd.exe
2804	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	emx.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	emx.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2804	PING.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3836	emx.exe
3836	emx.exe
3836	emx.exe
3836	emx.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3836	emx.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1224	2026-04-18_38f3c84d03e6d224a73ee1b8cc239c6e_coinminer_elex_wannacry.exe
1116	mrmck.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1224 wrote to memory of 3480	1224	2026-04-18_38f3c84d03e6d224a73ee1b8cc239c6e_coinminer_elex_wannacry.exe	85
PID 3480 wrote to memory of 2804	3480	cmd.exe	87
PID 3480 wrote to memory of 1116	3480	cmd.exe	88
PID 1116 wrote to memory of 3836	1116	mrmck.exe	89

C:\Users\Admin\AppData\Local\Temp\2026-04-18_38f3c84d03e6d224a73ee1b8cc239c6e_coinminer_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-18_38f3c84d03e6d224a73ee1b8cc239c6e_coinminer_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1224
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\mrmck.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-18_38f3c84d03e6d224a73ee1b8cc239c6e_coinminer_elex_wannacry.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3480
- - 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:2804
- - C:\Users\Admin\AppData\Local\Temp\mrmck.exe
    C:\Users\Admin\AppData\Local\Temp\\mrmck.exe "C:\Users\Admin\AppData\Local\Temp\2026-04-18_38f3c84d03e6d224a73ee1b8cc239c6e_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:1116
  - - \??\c:\Program Files\flzuur\emx.exe
      "c:\Program Files\flzuur\emx.exe" "c:\Program Files\flzuur\emxzq.dll",Group C:\Users\Admin\AppData\Local\Temp\mrmck.exe
      4⤵
      Executes dropped EXE
      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:3836

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

Replay Monitor

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Downloads

emx.exe

Path C:\Program Files\flzuur\emx.exe
Size 60KB
SHA256 6cbe0e1f046b13b29bfa26f8b368281d2dda7eb9b718651d5856f22cc3e02910
MD5 889b99c52a60dd49227c5e485a016679
SHA1 8fa889e456aa646a4d0a4349977430ce5fa5e2d7
SHA512 08933106eaf338dd119c45cbf1f83e723aff77cc0f8d3fc84e36253b1eb31557a54211d1d5d1cb58958188e32064d451f6c66a24b3963cccd3de07299ab90641
SSDEEP 1536:H9ykYCTdiHQKrFXmw2RQln5IUmDjoX6+:HlMHprF2nRQln5I
TLSH
T127532AC2FA00C171D4A7563019778F1A5766AC13DB728ACB94B0B4A41EB3291AD3E5FF
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

mrmck.exe

Path C:\Users\Admin\AppData\Local\Temp\mrmck.exe
Size 295KB
SHA256 20ef5513c95a08f07d5e39b885d21fb288acdfae76886deac6309c0e6488c2ec
MD5 374fa7d81f63d579bb22150c4fe80657
SHA1 446f128a858889048e896173acc1b232798c4552
SHA512 db08e3cdf076fdb8e8b829bd562a52965b1cb6edbf86e5f27cb4779721ffd3cb8315b0691e348c6f12e15ebf88a62542e39796f082c8fc2fbeedfea57756209f
SSDEEP 3072:qtaoOzbY5l/Tx1DUDcbouGYefD5h1zZCBgb3EInA3rdCKA9bwpfMrgsAHuskkycD:qtatPE5Txvev1zQBgexOdw6rpI9Fs29
TLSH
T1B7547C1233E44869E4EA3A72CE76A630D7F6EC75AC33D67B03D4430E5A36A04CB55366
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

emxzq.dll

Path \??\c:\Program Files\flzuur\emxzq.dll
Size 97KB
SHA256 a91a2050de482648cede503d909a9d74fd6fdbac9205db70a6689e04a526e5f0
MD5 0b20eea66a3677f930c85c91988f681f
SHA1 7789dac1b72206f2a16bd55006038c4503fc63e0
SHA512 ccaf84968b406179f4403b374c07eb66b13d67997a7282170b5166f48971c89c13471491ccd17601ee8be4c7c85b482afe38a4bd14ace37f593999e1b0d3c581
SSDEEP 3072:BDpG6gzgHr5tCmfk455ecDBkdq+SStvAbGe:5pG6Sg9txRk/SS6bGe
TLSH
T170A301FA290D7DD6CB354839D6528E35F629EE348C589F887ECE7C13ACB8510E1641B1
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1116-10-0x0000000000400000-0x000000000043F000-memory.dmp

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memory/1224-0-0x0000000000400000-0x000000000043F000-memory.dmp

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memory/1224-2-0x0000000000400000-0x000000000043F000-memory.dmp

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memory/3836-14-0x0000000010000000-0x0000000010038000-memory.dmp

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memory/3836-15-0x0000000010000000-0x0000000010038000-memory.dmp

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memory/3836-16-0x0000000003450000-0x0000000003469000-memory.dmp

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memory/3836-22-0x0000000010000000-0x0000000010038000-memory.dmp

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