juko | 1f891d74e3cfcd94f2f828c1177fdd9d5d9660608fc036d45955492bf069c1f3

General

Target
2026-04-20_6e66c6742830bcbd4b38e52ba1891a72_elex_wannacry.exe
Size 49KB
Sample260420-prba8sew71
SHA256 1f891d74e3cfcd94f2f828c1177fdd9d5d9660608fc036d45955492bf069c1f3
MD5 6e66c6742830bcbd4b38e52ba1891a72
SHA1 f30d52f022dca4b14fa90ad42d3423b99330d076
SHA512 b24690b38e606fa7aaa7c6e56edba37bd707cb9b01f204b8e883d3e90e67d15247e02113c284f7cd7804fbbbb84f20d0bebda6942fa80d3d59e2d69f8bfb847e
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2B:VLy2Kerc64CiGImVu8p4kojWh2B
TLSH
T1B8334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/2892-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000b00000002166e-5.dat	family_juko
behavioral1/memory/2892-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2612-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0008000000024455-15.dat	family_juko
behavioral1/memory/5588-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/5588-18-0x0000000000400000-0x0000000000420000-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-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	2026-04-20_6e66c6742830bcbd4b38e52ba1891a72_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2612	WINWORD.exe
5588	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-1-5-21-914486190-3969805341-592249730-1000\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	2026-04-20_6e66c6742830bcbd4b38e52ba1891a72_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
5880	PING.EXE
3320	cmd.exe
812	PING.EXE
2508	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5880	PING.EXE
812	PING.EXE
2508	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2892 wrote to memory of 2612	2892	2026-04-20_6e66c6742830bcbd4b38e52ba1891a72_elex_wannacry.exe	85
PID 2612 wrote to memory of 3320	2612	WINWORD.exe	86
PID 3320 wrote to memory of 812	3320	cmd.exe	88
PID 3320 wrote to memory of 2508	3320	cmd.exe	90
PID 3320 wrote to memory of 5880	3320	cmd.exe	91
PID 3320 wrote to memory of 5588	3320	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-04-20_6e66c6742830bcbd4b38e52ba1891a72_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-20_6e66c6742830bcbd4b38e52ba1891a72_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2892
- 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:2612
- - 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\0000700D" 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:3320
  - - 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:812
  - - 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:2508
  - - 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:5880
  - - 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:5588

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

0000700D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000700D
Size 49KB
SHA256 96b6c500c745be5e99a90f1b21eac54397bbf636ceddf524ea6dc35919933107
MD5 98c50a1486fc08b4f1a03dea4640a6c0
SHA1 bd5da99d1f37f4d33cc8c62e35d47aea65b28db9
SHA512 771a4a3209a3f18e7d98ed9e76efe56657fa537734447aa7db0e2d7b8c0af84c1365cc295b2300b4dc74bd515d9ec25ffb8fd9184d351e08257386f1a5ec90df
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2e:VLy2Kerc64CiGImVu8p4kojWh2e
TLSH
T163334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 1f891d74e3cfcd94f2f828c1177fdd9d5d9660608fc036d45955492bf069c1f3
MD5 6e66c6742830bcbd4b38e52ba1891a72
SHA1 f30d52f022dca4b14fa90ad42d3423b99330d076
SHA512 b24690b38e606fa7aaa7c6e56edba37bd707cb9b01f204b8e883d3e90e67d15247e02113c284f7cd7804fbbbb84f20d0bebda6942fa80d3d59e2d69f8bfb847e
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2B:VLy2Kerc64CiGImVu8p4kojWh2B
TLSH
T1B8334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2612-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2892-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2892-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5588-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5588-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads