juko | a8789b399bba40e8f7d83e8164cf406143700ecb002a17ec7ea5584b99d932b2

General

Target
2026-08-19_a7a147a9d134522640a8e8709c1d3a81_elex_wannacry.exe
Size 32KB
Sample260819-jvsrssdh47
SHA256 a8789b399bba40e8f7d83e8164cf406143700ecb002a17ec7ea5584b99d932b2
MD5 a7a147a9d134522640a8e8709c1d3a81
SHA1 29ff020865ddeba523b9578c482037a78c136459
SHA512 8bf25f5c45bcf8b742680bd73c321e62ec35f8bcfbabeaf3e740ef7a257a283843ff5aa27bd866699b382840206441447435a74bbb46abda9c00bcee7ce651cb
SSDEEP 768:RZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqbNPWQHJnd:bLsF2Kerc64sTiX2IV0DEand
TLSH
T1B7E22B2B2AA57052C59320B0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ECE
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 2 IoCs

resource	yara_rule
behavioral1/files/0x000b000000016817-4.dat	family_juko
behavioral1/files/0x000400000001e6de-12.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-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	2026-08-19_a7a147a9d134522640a8e8709c1d3a81_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
4948	WINWORD.exe
2320	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
3368	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	2026-08-19_a7a147a9d134522640a8e8709c1d3a81_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
3368	cmd.exe
4476	PING.EXE
1364	PING.EXE
988	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4476	PING.EXE
1364	PING.EXE
988	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 408 wrote to memory of 4948	408	2026-08-19_a7a147a9d134522640a8e8709c1d3a81_elex_wannacry.exe	87
PID 4948 wrote to memory of 3368	4948	WINWORD.exe	88
PID 3368 wrote to memory of 4476	3368	cmd.exe	90
PID 3368 wrote to memory of 1364	3368	cmd.exe	92
PID 3368 wrote to memory of 988	3368	cmd.exe	93
PID 3368 wrote to memory of 2320	3368	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-19_a7a147a9d134522640a8e8709c1d3a81_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-19_a7a147a9d134522640a8e8709c1d3a81_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:408
- 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:4948
- - 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\000010B4" 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:3368
  - - 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:4476
  - - 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:1364
  - - 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:988
  - - 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:2320

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

000010B4

Path C:\Users\Admin\AppData\Roaming\Mozilla\000010B4
Size 32KB
SHA256 38e4e573a2246e248710ff9b5ac389ffdd15c66ca580c097e0b753c958c884bf
MD5 595a77ab8a8cce3521b3398a5aacc26a
SHA1 7a9cef2c84f64e804b1c36718ce170be904a503a
SHA512 249e3a69bc41e22cfcf8864610437e7f1d9ef1a0f10682558d747da2a67e265c96b486b62a7883e52c42f30fbecdd43d20562d678f2b4593526ed6ef24c46ce1
SSDEEP 768:RZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqbNPWQHJnh:bLsF2Kerc64sTiX2IV0DEanh
TLSH
T14FE22B2B2AA57052C59320B0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 a8789b399bba40e8f7d83e8164cf406143700ecb002a17ec7ea5584b99d932b2
MD5 a7a147a9d134522640a8e8709c1d3a81
SHA1 29ff020865ddeba523b9578c482037a78c136459
SHA512 8bf25f5c45bcf8b742680bd73c321e62ec35f8bcfbabeaf3e740ef7a257a283843ff5aa27bd866699b382840206441447435a74bbb46abda9c00bcee7ce651cb
SSDEEP 768:RZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqbNPWQHJnd:bLsF2Kerc64sTiX2IV0DEand
TLSH
T1B7E22B2B2AA57052C59320B0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads