juko | 7c431e882b16b0b05238ecdc94547957e948b4f598f891e1da6cd0400ffcd36b

General

Target
2026-08-18_0ffb022a990203d5567de1a6e361fd84_elex_wannacry.exe
Size 49KB
Sample260818-qefkvsshpe
SHA256 7c431e882b16b0b05238ecdc94547957e948b4f598f891e1da6cd0400ffcd36b
MD5 0ffb022a990203d5567de1a6e361fd84
SHA1 b302cee0fd18ce2ebdc3ac9dab52f3771da5b669
SHA512 83896feca8fe5b226c878a5f77d91bc31fea38ffba179672333d7bcc605c298d73a5ad885bf9e614acfe110b915adf62efe48a6b0a56c117aa55ef4fd78f4ce4
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2B:VLy2Kerc64CiGImVucp4kojWh2B
TLSH
T127334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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 8 IoCs

resource	yara_rule
behavioral1/memory/4836-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000b0000000243e0-5.dat	family_juko
behavioral1/memory/4996-11-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4836-13-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4996-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00090000000244ad-16.dat	family_juko
behavioral1/memory/2132-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2132-19-0x0000000000400000-0x0000000000420000-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-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	2026-08-18_0ffb022a990203d5567de1a6e361fd84_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-540052884-2969440504-464782435-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4996	WINWORD.exe
2132	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-1-5-21-540052884-2969440504-464782435-1000\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
2196	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-18_0ffb022a990203d5567de1a6e361fd84_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

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
3840	PING.EXE
3428	PING.EXE
4780	PING.EXE
2196	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3840	PING.EXE
3428	PING.EXE
4780	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4836 wrote to memory of 4996	4836	2026-08-18_0ffb022a990203d5567de1a6e361fd84_elex_wannacry.exe	83
PID 4996 wrote to memory of 2196	4996	WINWORD.exe	85
PID 2196 wrote to memory of 3840	2196	cmd.exe	87
PID 2196 wrote to memory of 3428	2196	cmd.exe	90
PID 2196 wrote to memory of 4780	2196	cmd.exe	93
PID 2196 wrote to memory of 2132	2196	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-18_0ffb022a990203d5567de1a6e361fd84_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-18_0ffb022a990203d5567de1a6e361fd84_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4836
- 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:4996
- - 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\00002E01" 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:2196
  - - 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:3840
  - - 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:3428
  - - 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:4780
  - - 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:2132

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

00002E01

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002E01
Size 49KB
SHA256 a73c471df2f76e049506095811bd375a048be3bee0e382126c721c1e10bcd369
MD5 6bd20fb9895bd78ef57921a95b45f833
SHA1 7ebcef46605b6c17268cf801b1f9bc9830a75496
SHA512 cb06119460a5e4f9a08dda5490398b1d5ed5c4597f3324bc3a61282cb433ddc9b63af24ac88cf4aeaadbee7deb0c1d88e4e2b1a56728775064873b2a80691bc5
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h29:VLy2Kerc64CiGImVucp4kojWh29
TLSH
T1E7334B0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 7c431e882b16b0b05238ecdc94547957e948b4f598f891e1da6cd0400ffcd36b
MD5 0ffb022a990203d5567de1a6e361fd84
SHA1 b302cee0fd18ce2ebdc3ac9dab52f3771da5b669
SHA512 83896feca8fe5b226c878a5f77d91bc31fea38ffba179672333d7bcc605c298d73a5ad885bf9e614acfe110b915adf62efe48a6b0a56c117aa55ef4fd78f4ce4
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2B:VLy2Kerc64CiGImVucp4kojWh2B
TLSH
T127334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2132-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2132-19-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4836-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4836-13-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4996-11-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4996-15-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads