juko | d2d6ef90a3b7d3d39e80687bff11046afe31e6c1cd9c3f0fa64c8f58e278ed9e

General

Target
2026-08-06_105165f3f0f96685240c508a134f0a8b_elex_wannacry.exe
Size 49KB
Sample260806-maxf2as1ft
SHA256 d2d6ef90a3b7d3d39e80687bff11046afe31e6c1cd9c3f0fa64c8f58e278ed9e
MD5 105165f3f0f96685240c508a134f0a8b
SHA1 160eaca1695743933da1c4cb0a6613988fb6b6d7
SHA512 f2e82efbe1e1a3b3ab42c1c4e44f40c2e98bf5da7e62ce2a216982179fd3ab2798aa826cedbe1235a0ecaa46272c286d8500520701d357d7b324d528b5983712
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2D:4Ly2Kerc64CiGImVu8p4kojWh2D
TLSH
T195334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/3028-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00170000000242b3-5.dat	family_juko
behavioral1/memory/3028-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4752-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00090000000243f4-15.dat	family_juko
behavioral1/memory/1472-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1472-18-0x0000000000400000-0x0000000000420000-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-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	2026-08-06_105165f3f0f96685240c508a134f0a8b_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
4752	WINWORD.exe
1472	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
3772	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	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	2026-08-06_105165f3f0f96685240c508a134f0a8b_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

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
2368	PING.EXE
5004	PING.EXE
3644	PING.EXE
3772	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2368	PING.EXE
5004	PING.EXE
3644	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3028 wrote to memory of 4752	3028	2026-08-06_105165f3f0f96685240c508a134f0a8b_elex_wannacry.exe	84
PID 4752 wrote to memory of 3772	4752	WINWORD.exe	85
PID 3772 wrote to memory of 2368	3772	cmd.exe	87
PID 3772 wrote to memory of 5004	3772	cmd.exe	88
PID 3772 wrote to memory of 3644	3772	cmd.exe	90
PID 3772 wrote to memory of 1472	3772	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-08-06_105165f3f0f96685240c508a134f0a8b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-06_105165f3f0f96685240c508a134f0a8b_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3028
- 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:4752
- - 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\0000399A" 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:3772
  - - 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:2368
  - - 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:5004
  - - 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:3644
  - - 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:1472

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

0000399A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000399A
Size 49KB
SHA256 c929692cb01dc58f5a79cfc035a5f3e326614f95f3a2ef9fdc2e0b23d4b7b8ad
MD5 608215acd474023762e439416aedda8b
SHA1 657766a0dae439d96c336c720d18548e129e7032
SHA512 781c97f1d129a6caefc865c7a99a905437bbf6be71a70d9dde7e0e1b983eeb52628e9cca24187b11cbcce3d5f63b77716f67ff8fa87898c051fa1fb5d8f28c8f
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2e:4Ly2Kerc64CiGImVu8p4kojWh2e
TLSH
T185334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 d2d6ef90a3b7d3d39e80687bff11046afe31e6c1cd9c3f0fa64c8f58e278ed9e
MD5 105165f3f0f96685240c508a134f0a8b
SHA1 160eaca1695743933da1c4cb0a6613988fb6b6d7
SHA512 f2e82efbe1e1a3b3ab42c1c4e44f40c2e98bf5da7e62ce2a216982179fd3ab2798aa826cedbe1235a0ecaa46272c286d8500520701d357d7b324d528b5983712
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2D:4Ly2Kerc64CiGImVu8p4kojWh2D
TLSH
T195334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1472-17-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/1472-18-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3028-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3028-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4752-14-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads