juko | 9859c7b9e10a2dc272570fe9fc428d189ac87cf6d90b03687805f55699c33314

General

Target
2026-08-30_26b91917a5aebbd97114a4e82befe059_elex_wannacry.exe
Size 88KB
Sample260901-e9p71asfqf
SHA256 9859c7b9e10a2dc272570fe9fc428d189ac87cf6d90b03687805f55699c33314
MD5 26b91917a5aebbd97114a4e82befe059
SHA1 7c58d2e4387e95f1450bbf3b66c9408b3f851c09
SHA512 edd5ff8415f8aeead83d997faf780ec687a5b9bc6672aaca84493b25f378c79f10344e1d9f9edeb7911e78cbb055468b3bb9f8d4c766b01e8ee50508429f4d17
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs5:zLy2Kerc64CiGImHc/28wzCBlycJWeeO
TLSH
T1F3933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/1924-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x001100000001e83c-5.dat	family_juko
behavioral1/memory/1924-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/4592-14-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x000a000000024320-15.dat	family_juko
behavioral1/memory/1876-17-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/1876-18-0x0000000000400000-0x000000000042A000-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-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	2026-08-30_26b91917a5aebbd97114a4e82befe059_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4592	WINWORD.exe
1876	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-1-5-21-1788976790-1541110888-1636651838-1000\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
2576	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-30_26b91917a5aebbd97114a4e82befe059_elex_wannacry.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
2588	PING.EXE
2576	cmd.exe
1780	PING.EXE
2372	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2588	PING.EXE
1780	PING.EXE
2372	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1924 wrote to memory of 4592	1924	2026-08-30_26b91917a5aebbd97114a4e82befe059_elex_wannacry.exe	87
PID 4592 wrote to memory of 2576	4592	WINWORD.exe	88
PID 2576 wrote to memory of 1780	2576	cmd.exe	90
PID 2576 wrote to memory of 2372	2576	cmd.exe	91
PID 2576 wrote to memory of 2588	2576	cmd.exe	92
PID 2576 wrote to memory of 1876	2576	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-30_26b91917a5aebbd97114a4e82befe059_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-30_26b91917a5aebbd97114a4e82befe059_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1924
- 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:4592
- - 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\000035EF" 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:2576
  - - 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:1780
  - - 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:2372
  - - 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:2588
  - - 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:1876

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

000035EF

Path C:\Users\Admin\AppData\Roaming\Mozilla\000035EF
Size 88KB
SHA256 36f32c6d609ae0ad304719830e144603d3b02def9da8ec0ea097f92664cadb73
MD5 94d9ea62719a6e7b8568f8e03066b554
SHA1 66abe3c68c2d9c2a082c9a8ca836a5a641711f98
SHA512 dc1d328604af02570c488af70e2e0eed9ad9f480eb50abc5658dc31d94b182180fef47c38a8481b86400f95792b14732c4476b3e154fc0b0fa421d29f8b62ce7
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrse:zLy2Kerc64CiGImHc/28wzCBlycJWeeV
TLSH
T1D5933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 9859c7b9e10a2dc272570fe9fc428d189ac87cf6d90b03687805f55699c33314
MD5 26b91917a5aebbd97114a4e82befe059
SHA1 7c58d2e4387e95f1450bbf3b66c9408b3f851c09
SHA512 edd5ff8415f8aeead83d997faf780ec687a5b9bc6672aaca84493b25f378c79f10344e1d9f9edeb7911e78cbb055468b3bb9f8d4c766b01e8ee50508429f4d17
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs5:zLy2Kerc64CiGImHc/28wzCBlycJWeeO
TLSH
T1F3933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1876-17-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/1876-18-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/1924-0-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/1924-12-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/4592-14-0x0000000000400000-0x000000000042A000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads