juko | 986bb0981559aa59e486de93bcb74447c4710cd4e73e1ab80ff72f6034fbb58b

General

Target
2026-05-07_0f3ab04b53da569d5e546ec844a9a4c4_elex_wannacry.exe
Size 32KB
Sample260507-jcsdbacz6p
SHA256 986bb0981559aa59e486de93bcb74447c4710cd4e73e1ab80ff72f6034fbb58b
MD5 0f3ab04b53da569d5e546ec844a9a4c4
SHA1 e43ce80d1ef5cb43435a0cbab03eafdcbc5da3d2
SHA512 40fa786131170ac52b14748a166830f2bab8a9724916d6725f7dc0f0bc9c8d2f27f2692d139653276ec532f946ed3843093c22f5d16333032edc8e6459dc03f1
SSDEEP 768:uNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqwNPWQHD4kqXlP:cLsF2Kerc64sTiX2IV0DzY4kMZ
TLSH
T1F0E23B2B6AA17052C59320B0F9592F35C43D9CB9016BB062F7417B6928B2D63CF71ECE
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 2 IoCs

resource	yara_rule
behavioral1/files/0x000b00000001e6e5-4.dat	family_juko
behavioral1/files/0x001a0000000243f9-14.dat	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	2026-05-07_0f3ab04b53da569d5e546ec844a9a4c4_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
828	WINWORD.exe
2368	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-07_0f3ab04b53da569d5e546ec844a9a4c4_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
3976	cmd.exe
4580	PING.EXE
5608	PING.EXE
2496	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4580	PING.EXE
5608	PING.EXE
2496	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4632 wrote to memory of 828	4632	2026-05-07_0f3ab04b53da569d5e546ec844a9a4c4_elex_wannacry.exe	86
PID 828 wrote to memory of 3976	828	WINWORD.exe	88
PID 3976 wrote to memory of 4580	3976	cmd.exe	90
PID 3976 wrote to memory of 5608	3976	cmd.exe	91
PID 3976 wrote to memory of 2496	3976	cmd.exe	93
PID 3976 wrote to memory of 2368	3976	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-05-07_0f3ab04b53da569d5e546ec844a9a4c4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-07_0f3ab04b53da569d5e546ec844a9a4c4_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4632
- 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:828
- - 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\000017DF" 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:3976
  - - 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:4580
  - - 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:5608
  - - 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:2496
  - - 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:2368

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

000017DF

Path C:\Users\Admin\AppData\Roaming\Mozilla\000017DF
Size 32KB
SHA256 4d73c8c4b26dcdc2598c711a2fe3254765560579b2d2a96d7ef1dd997b71f7cc
MD5 d1d497c5fb4f08582a746a24bd6e84d9
SHA1 2957a2005106a4b4f3323b46a80f22ab363cfa6c
SHA512 1cb1c0b523d761abc1cf35e3a30e0f256732f464a3591e54e5f6434da802d40728cf4fb403212afa71ae8c1184ea27a6839e73b74316710505a4f0d686987af7
SSDEEP 768:uNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqwNPWQHD4kqXlV:cLsF2Kerc64sTiX2IV0DzY4kMT
TLSH
T164E23B2B6AA17052C59320B0F9592F35C43D9CB9016BB062F7417B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 986bb0981559aa59e486de93bcb74447c4710cd4e73e1ab80ff72f6034fbb58b
MD5 0f3ab04b53da569d5e546ec844a9a4c4
SHA1 e43ce80d1ef5cb43435a0cbab03eafdcbc5da3d2
SHA512 40fa786131170ac52b14748a166830f2bab8a9724916d6725f7dc0f0bc9c8d2f27f2692d139653276ec532f946ed3843093c22f5d16333032edc8e6459dc03f1
SSDEEP 768:uNZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqwNPWQHD4kqXlP:cLsF2Kerc64sTiX2IV0DzY4kMZ
TLSH
T1F0E23B2B6AA17052C59320B0F9592F35C43D9CB9016BB062F7417B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/828-13-0x00000000023E0000-0x000000000245E000-memory.dmp

Download

memory/2368-16-0x00000000022A0000-0x000000000231E000-memory.dmp

Download

memory/4632-11-0x0000000001F40000-0x0000000001FBE000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads