juko | 90b94c7c24df4fab20aeefc9e91cccea9986ba5643171f99adcbdc69576c6ff3

General

Target
2026-08-10_e7d4595da18c43ef5cc9c031929b4075_elex_wannacry.exe
Size 49KB
Sample260810-gftdnssbme
SHA256 90b94c7c24df4fab20aeefc9e91cccea9986ba5643171f99adcbdc69576c6ff3
MD5 e7d4595da18c43ef5cc9c031929b4075
SHA1 dc99507d49da8dd146c8551a0a1f18f804540fc2
SHA512 b3a14132fb228f80b1e2d727d6889dd94e59f2d5133faad9bf2611833b9c7f6a4b6681b17170677dfa4d2f671118d079ea840ab92c1cc508f4e66e00835d63ec
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2N:VLy2Kerc64CiGImVucp4kojWh2N
TLSH
T1C1334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution 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/3820-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00080000000245fb-5.dat	family_juko
behavioral1/memory/3820-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3732-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000400000001e699-15.dat	family_juko
behavioral1/memory/556-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/556-18-0x0000000000400000-0x0000000000420000-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-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	2026-08-10_e7d4595da18c43ef5cc9c031929b4075_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
3732	WINWORD.exe
556	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-1-5-21-2937465464-4167303362-2236413517-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
3604	cmd.exe

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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-10_e7d4595da18c43ef5cc9c031929b4075_elex_wannacry.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
4204	PING.EXE
3664	PING.EXE
3604	cmd.exe
1884	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1884	PING.EXE
4204	PING.EXE
3664	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3820 wrote to memory of 3732	3820	2026-08-10_e7d4595da18c43ef5cc9c031929b4075_elex_wannacry.exe	86
PID 3732 wrote to memory of 3604	3732	WINWORD.exe	87
PID 3604 wrote to memory of 1884	3604	cmd.exe	89
PID 3604 wrote to memory of 4204	3604	cmd.exe	90
PID 3604 wrote to memory of 3664	3604	cmd.exe	91
PID 3604 wrote to memory of 556	3604	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-08-10_e7d4595da18c43ef5cc9c031929b4075_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_e7d4595da18c43ef5cc9c031929b4075_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3820
- 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:3732
- - 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\000031FC" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3604
  - - 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:1884
  - - 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:4204
  - - 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:3664
  - - 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:556

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

000031FC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000031FC
Size 49KB
SHA256 ac8d2c725b71198d0583aca21cc04fed1976929b489e07965342135cba2147e4
MD5 26c2e8975d7e6cec00f59968e6882305
SHA1 6a517540bde33c7ae2074cea18465c9e77162054
SHA512 85cc21e45b908ce36533334aac097df94f2a957bb0cce6169d2302eca9c7fdd525b8179b732f2a6179297b67b245a574684ca23c215aa5f6bd85f8842b6bf59e
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2s:VLy2Kerc64CiGImVucp4kojWh2s
TLSH
T124334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 90b94c7c24df4fab20aeefc9e91cccea9986ba5643171f99adcbdc69576c6ff3
MD5 e7d4595da18c43ef5cc9c031929b4075
SHA1 dc99507d49da8dd146c8551a0a1f18f804540fc2
SHA512 b3a14132fb228f80b1e2d727d6889dd94e59f2d5133faad9bf2611833b9c7f6a4b6681b17170677dfa4d2f671118d079ea840ab92c1cc508f4e66e00835d63ec
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2N:VLy2Kerc64CiGImVucp4kojWh2N
TLSH
T1C1334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/556-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/556-18-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3732-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3820-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3820-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads