juko | 091f879d8110e86cf1e3a6a9eecde79847482e7f5bfcdb4ca6e1b709f8c462c9

General

Target
2026-05-17_d6f907567cd341483e3a610c4973b667_elex_wannacry.exe
Size 49KB
Sample260517-qplvmagy7y
SHA256 091f879d8110e86cf1e3a6a9eecde79847482e7f5bfcdb4ca6e1b709f8c462c9
MD5 d6f907567cd341483e3a610c4973b667
SHA1 d72e3d3e7004cc7ea21c74c555deac9ceead7749
SHA512 cd5bdade188d4ee95a338427ffe89f4b21aa0c3ba6571335590799190745aec6f057ca2953a34902a8ecbc717ae8d903247350cc14be9ba5afb5445bd435d3bd
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2O:4Ly2Kerc64CiGImVu8p4kojWh2O
TLSH
T1C0334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 7 IoCs

resource	yara_rule
behavioral2/memory/5076-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x002000000002b2e0-5.dat	family_juko
behavioral2/memory/5076-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4084-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b4ee-15.dat	family_juko
behavioral2/memory/3356-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3356-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4084	WINWORD.exe
3356	WINWORD.exe

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-1-5-21-2654269261-3199571979-4291878722-1000\Software\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 7 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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-17_d6f907567cd341483e3a610c4973b667_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
3748	cmd.exe
4808	PING.EXE
3288	PING.EXE
3204	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4808	PING.EXE
3288	PING.EXE
3204	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5076 wrote to memory of 4084	5076	2026-05-17_d6f907567cd341483e3a610c4973b667_elex_wannacry.exe	81
PID 4084 wrote to memory of 3748	4084	WINWORD.exe	82
PID 3748 wrote to memory of 4808	3748	cmd.exe	84
PID 3748 wrote to memory of 3288	3748	cmd.exe	85
PID 3748 wrote to memory of 3204	3748	cmd.exe	86
PID 3748 wrote to memory of 3356	3748	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-05-17_d6f907567cd341483e3a610c4973b667_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-17_d6f907567cd341483e3a610c4973b667_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5076
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4084
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\00002A03" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3748
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4808
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:3288
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:3204
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:3356

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

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Remote System Discovery

1

T1018

System Information Discovery

1

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

Command and Control

Exfiltration

Impact

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Downloads

00002A03

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002A03
Size 49KB
SHA256 b371c96f58f7100cb34d09035696915457fb83bdb1665e1370d4a8053ecadca8
MD5 7f0917207e86f1d70b3c6c5314daf4ab
SHA1 099c40688a0dacdee69fbf35a6a1dcd3d49d8842
SHA512 1999fb360e8a35e11b0579f0b99cb27a2b5e383711ba5787f36d5d85b7be6c0c281fdcafb11cb11fb5c7a286662f4db08f6a121a85329df3b645b36b971b6789
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2I:4Ly2Kerc64CiGImVu8p4kojWh2I
TLSH
T1FF334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 091f879d8110e86cf1e3a6a9eecde79847482e7f5bfcdb4ca6e1b709f8c462c9
MD5 d6f907567cd341483e3a610c4973b667
SHA1 d72e3d3e7004cc7ea21c74c555deac9ceead7749
SHA512 cd5bdade188d4ee95a338427ffe89f4b21aa0c3ba6571335590799190745aec6f057ca2953a34902a8ecbc717ae8d903247350cc14be9ba5afb5445bd435d3bd
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2O:4Ly2Kerc64CiGImVu8p4kojWh2O
TLSH
T1C0334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3356-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3356-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4084-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5076-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5076-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads