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
behavioral1/memory/820-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000b000000024173-5.dat	family_juko
behavioral1/memory/820-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4608-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0009000000024328-15.dat	family_juko
behavioral1/memory/1692-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1692-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	2026-05-17_d6f907567cd341483e3a610c4973b667_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4608	WINWORD.exe
1692	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-1-5-21-889581200-2041691093-2048517887-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
4516	cmd.exe
2428	PING.EXE
5084	PING.EXE
3892	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2428	PING.EXE
5084	PING.EXE
3892	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 820 wrote to memory of 4608	820	2026-05-17_d6f907567cd341483e3a610c4973b667_elex_wannacry.exe	84
PID 4608 wrote to memory of 4516	4608	WINWORD.exe	85
PID 4516 wrote to memory of 2428	4516	cmd.exe	87
PID 4516 wrote to memory of 5084	4516	cmd.exe	88
PID 4516 wrote to memory of 3892	4516	cmd.exe	89
PID 4516 wrote to memory of 1692	4516	cmd.exe	90

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:820
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4608
- - 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\00005411" 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:4516
  - - 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:2428
  - - 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:5084
  - - 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:3892
  - - 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:1692

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

Query Registry

1

T1012

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

Command and Control

Exfiltration

Impact

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Downloads

00005411

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005411
Size 49KB
SHA256 f27ce78b918368b0baabb4f6dae80e0a61689893451db1f6120c1f83438551dc
MD5 f6a6828491943d356871f96521aaf150
SHA1 ffaed176f85dcb9ea14c702bc2de051a1848dacc
SHA512 92445416def6974a39d348d4a7aff9fa3de4fbc62b61121eaecddeae4891b1f0ede74279053e6142764bd26d2249f702331025cefa8ab05b6ba04014f559da5e
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h22:4Ly2Kerc64CiGImVu8p4kojWh22
TLSH
T17D334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/820-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/820-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1692-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1692-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4608-14-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads