juko | 9b48cea64ad6f534155b88e01c788be45f9a6a5e3884b0240e030d12cff67188

General

Target
2026-08-09_4962b4b7e7e9b0db70993b99a40d07fb_elex_wannacry.exe
Size 68KB
Sample260809-31gq9sfp21
SHA256 9b48cea64ad6f534155b88e01c788be45f9a6a5e3884b0240e030d12cff67188
MD5 4962b4b7e7e9b0db70993b99a40d07fb
SHA1 e1cb4e0a8963a24679f39fdf834cbbdb1b770482
SHA512 54436dd749d2eb25ebcca7fb4fe1d7e1a22f5c93deae29bfef05e086d4dfab4eebc553698c6985088f05f035c99a5d2a370bdcd5fed68decd3489f8021a80f7b
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpF:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpF
TLSH
T12763A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
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/2316-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000c000000023360-5.dat	family_juko
behavioral1/memory/2316-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/3496-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x00090000000243de-15.dat	family_juko
behavioral1/memory/4596-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4596-18-0x0000000000400000-0x0000000000425000-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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	2026-08-09_4962b4b7e7e9b0db70993b99a40d07fb_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3496	WINWORD.exe
4596	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-1-5-21-1074038928-2032447174-945360078-1000\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
4868	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	2026-08-09_4962b4b7e7e9b0db70993b99a40d07fb_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
3540	PING.EXE
2532	PING.EXE
4868	cmd.exe
2748	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3540	PING.EXE
2532	PING.EXE
2748	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2316 wrote to memory of 3496	2316	2026-08-09_4962b4b7e7e9b0db70993b99a40d07fb_elex_wannacry.exe	85
PID 3496 wrote to memory of 4868	3496	WINWORD.exe	86
PID 4868 wrote to memory of 2748	4868	cmd.exe	88
PID 4868 wrote to memory of 3540	4868	cmd.exe	89
PID 4868 wrote to memory of 2532	4868	cmd.exe	90
PID 4868 wrote to memory of 4596	4868	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-08-09_4962b4b7e7e9b0db70993b99a40d07fb_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_4962b4b7e7e9b0db70993b99a40d07fb_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2316
- 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:3496
- - 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\00006900" 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:4868
  - - 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:2748
  - - 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:3540
  - - 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:2532
  - - 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:4596

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

00006900

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006900
Size 68KB
SHA256 5c60254eee22ec564fb74690892cd88aa9a295271d05f260aba74f307fd29603
MD5 a2efbf0db3b0bd786472fdac706f170b
SHA1 bc5837bc7f23e0c9b53e792d87382ec60c8f1944
SHA512 50f3a3cebce7853f96725b7ef74ebd80a8e576c2cc647bdcc9030caad0c8130d9b52b72ab842ca8924a68c06fc4f32b84930027464ca15d923a7656a8ffea4f4
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpi:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpi
TLSH
T12863A0B629761011C48BD478E8186A60B933DCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 68KB
SHA256 9b48cea64ad6f534155b88e01c788be45f9a6a5e3884b0240e030d12cff67188
MD5 4962b4b7e7e9b0db70993b99a40d07fb
SHA1 e1cb4e0a8963a24679f39fdf834cbbdb1b770482
SHA512 54436dd749d2eb25ebcca7fb4fe1d7e1a22f5c93deae29bfef05e086d4dfab4eebc553698c6985088f05f035c99a5d2a370bdcd5fed68decd3489f8021a80f7b
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpF:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpF
TLSH
T12763A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2316-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2316-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3496-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4596-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4596-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads