juko | 393b26dea6edb9660bf4dbfc45ce3b91d0456cb594cd70869ace4cd8e521d08c

General

Target
2026-08-19_830ebe5da72f4cf873a5a4f8b7f5886d_elex_wannacry.exe
Size 30KB
Sample260819-qdn6lsvcrd
SHA256 393b26dea6edb9660bf4dbfc45ce3b91d0456cb594cd70869ace4cd8e521d08c
MD5 830ebe5da72f4cf873a5a4f8b7f5886d
SHA1 077c4c254640ef063aca078682a9dc5e76da2447
SHA512 74c08e42ff5955e563812a96a0e67af8fbc1f3d14dcb5e59a7b814ab6286369e23ff6c4110a204c8982a4ac45dbc5f00276af8191b1a029ad619f4a14e61f2ba
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrG:OLsF2Kerc64sTiX2IV0DkFMG
TLSH
T18CE27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
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/0x000a00000001138e-4.dat	family_juko
behavioral2/files/0x000e00000001c454-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3324	WINWORD.exe
6048	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-1-5-21-1079202589-886135813-2527035092-1000\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
916	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	2026-08-19_830ebe5da72f4cf873a5a4f8b7f5886d_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
916	cmd.exe
1468	PING.EXE
5056	PING.EXE
3460	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1468	PING.EXE
5056	PING.EXE
3460	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4676 wrote to memory of 3324	4676	2026-08-19_830ebe5da72f4cf873a5a4f8b7f5886d_elex_wannacry.exe	89
PID 3324 wrote to memory of 916	3324	WINWORD.exe	90
PID 916 wrote to memory of 1468	916	cmd.exe	92
PID 916 wrote to memory of 5056	916	cmd.exe	93
PID 916 wrote to memory of 3460	916	cmd.exe	94
PID 916 wrote to memory of 6048	916	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-19_830ebe5da72f4cf873a5a4f8b7f5886d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-19_830ebe5da72f4cf873a5a4f8b7f5886d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4676
- 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:3324
- - 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\00002639" 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:916
  - - 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:1468
  - - 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:5056
  - - 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:3460
  - - 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:6048

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

00002639

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002639
Size 30KB
SHA256 34d2d3c7cc10b3c164712eac6ac23798550c405c950634b6441aff0dccf3a262
MD5 7506fa6884837948c154645ceb494c76
SHA1 e329b5ed5f4a6a1f926e0ea19834ddb89bb42617
SHA512 2446dd92c33953b4d1f71ad72d3f88a48843cb0b4cbdf64415b446ff0aef325c5d8b02e404f5eee941ed444ee0648328e9531d7f0dff3cb5b86872b3e9729b6e
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrz:OLsF2Kerc64sTiX2IV0DkFMz
TLSH
T13AE27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 393b26dea6edb9660bf4dbfc45ce3b91d0456cb594cd70869ace4cd8e521d08c
MD5 830ebe5da72f4cf873a5a4f8b7f5886d
SHA1 077c4c254640ef063aca078682a9dc5e76da2447
SHA512 74c08e42ff5955e563812a96a0e67af8fbc1f3d14dcb5e59a7b814ab6286369e23ff6c4110a204c8982a4ac45dbc5f00276af8191b1a029ad619f4a14e61f2ba
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrG:OLsF2Kerc64sTiX2IV0DkFMG
TLSH
T18CE27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
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