juko | 23f636d080e0f1f97f41bb4d157f543757a6af027a448cbec2468bd3ed381a6d

General

Target
2026-07-02_b6a91d6452ea770f59503dbefbd07680_elex_wannacry.exe
Size 49KB
Sample260702-gpftyacs8y
SHA256 23f636d080e0f1f97f41bb4d157f543757a6af027a448cbec2468bd3ed381a6d
MD5 b6a91d6452ea770f59503dbefbd07680
SHA1 b567b658c18f99d03a81aab7cbd1622fd402baad
SHA512 e16c3ba0de35751c5ac805c8a644ca651a98e61c6b2e84db6c02eb511173b3123de473d305dbcd61464e0c49e24e91db1f2bc1855bace3718ca093c0d1f0612f
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2v:VLy2Kerc64CiGImVucp4kojWh2v
TLSH
T1CB334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/2372-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00080000000238c4-5.dat	family_juko
behavioral1/memory/2372-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2668-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000c0000000243c0-15.dat	family_juko
behavioral1/memory/1076-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1076-18-0x0000000000400000-0x0000000000420000-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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-07-02_b6a91d6452ea770f59503dbefbd07680_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2668	WINWORD.exe
1076	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-1-5-21-668679576-120646659-2289335452-1000\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	2026-07-02_b6a91d6452ea770f59503dbefbd07680_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
312	PING.EXE
2296	cmd.exe
4436	PING.EXE
1632	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4436	PING.EXE
1632	PING.EXE
312	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2372 wrote to memory of 2668	2372	2026-07-02_b6a91d6452ea770f59503dbefbd07680_elex_wannacry.exe	85
PID 2668 wrote to memory of 2296	2668	WINWORD.exe	86
PID 2296 wrote to memory of 4436	2296	cmd.exe	88
PID 2296 wrote to memory of 1632	2296	cmd.exe	91
PID 2296 wrote to memory of 312	2296	cmd.exe	94
PID 2296 wrote to memory of 1076	2296	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-02_b6a91d6452ea770f59503dbefbd07680_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-02_b6a91d6452ea770f59503dbefbd07680_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2372
- 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:2668
- - 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\00001B80" 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:2296
  - - 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:4436
  - - 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:1632
  - - 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:312
  - - 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:1076

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

00001B80

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001B80
Size 49KB
SHA256 b033785809739398b708ff3bec890a5b8a31d37754405e986f49a239c33c2b0f
MD5 ace7fb69c13f8b061f044937c901c3fe
SHA1 b7ff5fcf64498f1174281db3d96a85984c8176d0
SHA512 1a981dbda06fd5f77dd162bbd812a726fe32bdd7464a056b3091e79d5d94d4815eee820089f36b2a5a8a5886ec292822ed13fa1539aac60d03f8b871125ff18c
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h25:VLy2Kerc64CiGImVucp4kojWh25
TLSH
T102334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 23f636d080e0f1f97f41bb4d157f543757a6af027a448cbec2468bd3ed381a6d
MD5 b6a91d6452ea770f59503dbefbd07680
SHA1 b567b658c18f99d03a81aab7cbd1622fd402baad
SHA512 e16c3ba0de35751c5ac805c8a644ca651a98e61c6b2e84db6c02eb511173b3123de473d305dbcd61464e0c49e24e91db1f2bc1855bace3718ca093c0d1f0612f
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2v:VLy2Kerc64CiGImVucp4kojWh2v
TLSH
T1CB334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1076-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1076-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2372-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2372-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2668-14-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads