juko | 431163a6a7bfa4b0d069480ecb7c4ff323d397edbad156ac7ba4a4aefb2b9643

General

Target
2026-08-23_e42507b90a133d573e6d9d3d1929cb7d_elex_wannacry.exe
Size 53KB
Sample260823-v28mdatva1
SHA256 431163a6a7bfa4b0d069480ecb7c4ff323d397edbad156ac7ba4a4aefb2b9643
MD5 e42507b90a133d573e6d9d3d1929cb7d
SHA1 88d527b16c9be6e2eb3c63ba2806dc15c053791d
SHA512 7de583649b411502ce8dbc1c3cc97124b57d3ff64594df38611e486d8db5e0ce52e786f6dc2fb5acf710a45700201d189f46d1aae699d88a8b3872d00b05708a
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2v:3Ly2Kerc64CiGIm1tcBMUOOFv
TLSH
T172335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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
behavioral2/files/0x000b000000011390-4.dat	family_juko
behavioral2/files/0x0005000000016cbe-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4728	WINWORD.exe
3944	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-1-5-21-1738198120-2966725515-3980530802-1000\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
3384	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	2026-08-23_e42507b90a133d573e6d9d3d1929cb7d_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
3384	cmd.exe
4752	PING.EXE
1208	PING.EXE
4180	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4752	PING.EXE
1208	PING.EXE
4180	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 8 wrote to memory of 4728	8	2026-08-23_e42507b90a133d573e6d9d3d1929cb7d_elex_wannacry.exe	89
PID 4728 wrote to memory of 3384	4728	WINWORD.exe	90
PID 3384 wrote to memory of 4752	3384	cmd.exe	92
PID 3384 wrote to memory of 1208	3384	cmd.exe	93
PID 3384 wrote to memory of 4180	3384	cmd.exe	94
PID 3384 wrote to memory of 3944	3384	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-23_e42507b90a133d573e6d9d3d1929cb7d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-23_e42507b90a133d573e6d9d3d1929cb7d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:8
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4728
- - 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\00000D84" 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:3384
  - - 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:4752
  - - 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:1208
  - - 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:4180
  - - 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:3944

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

00000D84

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000D84
Size 53KB
SHA256 01726917ff3746884d9c33d62f37f19f2054476257a0e724b5bed36a351f5b1e
MD5 5a01ac7e1f58ae3f7e51372fec4fa3f8
SHA1 580483381208121192db854c8de112c1d7e9375c
SHA512 8608b7de5bdb84a1560fc63f1a5bbdbde6935018dce19671f62d84b57007670148d8dee8c44d051625b32ef7d41e275cf2f289cd7e8578cb2685db156e541b95
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2E:3Ly2Kerc64CiGIm1tcBMUOOFE
TLSH
T150335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 431163a6a7bfa4b0d069480ecb7c4ff323d397edbad156ac7ba4a4aefb2b9643
MD5 e42507b90a133d573e6d9d3d1929cb7d
SHA1 88d527b16c9be6e2eb3c63ba2806dc15c053791d
SHA512 7de583649b411502ce8dbc1c3cc97124b57d3ff64594df38611e486d8db5e0ce52e786f6dc2fb5acf710a45700201d189f46d1aae699d88a8b3872d00b05708a
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2v:3Ly2Kerc64CiGIm1tcBMUOOFv
TLSH
T172335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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