juko | 332e1adc2d111dc32ca117cb49b92f8cb6c12bb8801e6e1e8afb30c4d57be6af

General

Target
2026-08-09_26c77ab80008f73e9abc95537b849089_elex_wannacry.exe
Size 49KB
Sample260809-k8e9ascm9t
SHA256 332e1adc2d111dc32ca117cb49b92f8cb6c12bb8801e6e1e8afb30c4d57be6af
MD5 26c77ab80008f73e9abc95537b849089
SHA1 115bc5a650f3e21b7e0ff50111d591cae2f0c3e2
SHA512 a8537df0b1095ab870c9dfc932e52cba1388e34d4c9ea7f71d5ee1b792abc87a366898425f266eaefe5bee03c1e3d5ffcd72b56e7ecb29f808c94ccdd1bc2cd0
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2h:VLy2Kerc64CiGImVucp4kojWh2h
TLSH
T100334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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
behavioral2/memory/2948-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d000000016cdc-5.dat	family_juko
behavioral2/memory/2948-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5804-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5d1-13.dat	family_juko
behavioral2/memory/5356-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5356-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5804	WINWORD.exe
5356	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-1-5-21-552508041-2681165170-3229858294-1000\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
4540	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-09_26c77ab80008f73e9abc95537b849089_elex_wannacry.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
4540	cmd.exe
5208	PING.EXE
3612	PING.EXE
4676	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5208	PING.EXE
3612	PING.EXE
4676	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2948 wrote to memory of 5804	2948	2026-08-09_26c77ab80008f73e9abc95537b849089_elex_wannacry.exe	89
PID 5804 wrote to memory of 4540	5804	WINWORD.exe	90
PID 4540 wrote to memory of 5208	4540	cmd.exe	92
PID 4540 wrote to memory of 3612	4540	cmd.exe	93
PID 4540 wrote to memory of 4676	4540	cmd.exe	94
PID 4540 wrote to memory of 5356	4540	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_26c77ab80008f73e9abc95537b849089_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_26c77ab80008f73e9abc95537b849089_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2948
- 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:5804
- - 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\00004E74" 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:4540
  - - 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:5208
  - - 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:3612
  - - 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:4676
  - - 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:5356

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

00004E74

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004E74
Size 49KB
SHA256 39170d44daf31dcc0315d9019ed7f841b1358c1e821b28704f0483584cd95207
MD5 aa3472d56b7bdbed76fa8263d0a34737
SHA1 b6bf8b9b8296b307e91d3db93325074f842e564c
SHA512 ade5977f46d594951b8b57cf71247162f210354a39e27f3f8f05f6bbfc8efd3e5fe750e82bb841bd65fec73b4192278f1540cedb018482ab8cc6f33226687e99
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2x:VLy2Kerc64CiGImVucp4kojWh2x
TLSH
T1DA334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 332e1adc2d111dc32ca117cb49b92f8cb6c12bb8801e6e1e8afb30c4d57be6af
MD5 26c77ab80008f73e9abc95537b849089
SHA1 115bc5a650f3e21b7e0ff50111d591cae2f0c3e2
SHA512 a8537df0b1095ab870c9dfc932e52cba1388e34d4c9ea7f71d5ee1b792abc87a366898425f266eaefe5bee03c1e3d5ffcd72b56e7ecb29f808c94ccdd1bc2cd0
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2h:VLy2Kerc64CiGImVucp4kojWh2h
TLSH
T100334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2948-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2948-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5356-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5356-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5804-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads