juko | 5a7136073ce1d798de806df246e7647ab59c312cca111d6d2d9dedb4e1e5c16d

General

Target
2026-08-19_854cd4082051344de0c0929ac381855a_elex_wannacry.exe
Size 49KB
Sample260820-b2bsvsxfrb
SHA256 5a7136073ce1d798de806df246e7647ab59c312cca111d6d2d9dedb4e1e5c16d
MD5 854cd4082051344de0c0929ac381855a
SHA1 772dc33499824222dde687c8c4a4999d14eeb28c
SHA512 3fc2ad07bded81d2fc637e7ad8c58894d8c11ee69d5b07c08a7d550134d4ce2fd570c49c9c6dfb2db71dea208cc31ac8c0938f55909c4ee2f052d7662bf4afe0
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h28:VLy2Kerc64CiGImVucp4kojWh28
TLSH
T142334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/4772-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000900000001b884-5.dat	family_juko
behavioral2/memory/4772-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/256-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001000000001c4e1-13.dat	family_juko
behavioral2/memory/4716-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4716-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
256	WINWORD.exe
4716	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
1700	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-19_854cd4082051344de0c0929ac381855a_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

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
1700	cmd.exe
1440	PING.EXE
552	PING.EXE
2536	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1440	PING.EXE
552	PING.EXE
2536	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4772 wrote to memory of 256	4772	2026-08-19_854cd4082051344de0c0929ac381855a_elex_wannacry.exe	89
PID 256 wrote to memory of 1700	256	WINWORD.exe	90
PID 1700 wrote to memory of 1440	1700	cmd.exe	92
PID 1700 wrote to memory of 552	1700	cmd.exe	93
PID 1700 wrote to memory of 2536	1700	cmd.exe	94
PID 1700 wrote to memory of 4716	1700	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-19_854cd4082051344de0c0929ac381855a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-19_854cd4082051344de0c0929ac381855a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4772
- 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:256
- - 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\00000B66" 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:1700
  - - 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:1440
  - - 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:552
  - - 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:2536
  - - 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:4716

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

00000B66

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000B66
Size 49KB
SHA256 835722e81f7db85f3ef2f435678632fd8b1aad064de800f72dfa6ed53481d216
MD5 f41ed7e2069a935339e21481d62df2d4
SHA1 152a1fe4afe16b6a4b7fab50bf019d30891143e8
SHA512 3495168faad94c5124a18ff943c25b80af5cb0f6bcfdb108ab2cb96f5e5993988183cea9579d935c15dd6330c3671dcb0097af66909ee238ecfa6c05b192be40
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2T:VLy2Kerc64CiGImVucp4kojWh2T
TLSH
T16C334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 5a7136073ce1d798de806df246e7647ab59c312cca111d6d2d9dedb4e1e5c16d
MD5 854cd4082051344de0c0929ac381855a
SHA1 772dc33499824222dde687c8c4a4999d14eeb28c
SHA512 3fc2ad07bded81d2fc637e7ad8c58894d8c11ee69d5b07c08a7d550134d4ce2fd570c49c9c6dfb2db71dea208cc31ac8c0938f55909c4ee2f052d7662bf4afe0
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h28:VLy2Kerc64CiGImVucp4kojWh28
TLSH
T142334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/256-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4716-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4716-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4772-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4772-9-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads