juko | a39812185d2dca1b9bc0c299771f37e35d51cef07f5c7d8fa1e8604eb77d731f

General

Target
2026-08-05_21241ebd224c0d519741ed1b9353c748_elex_wannacry.exe
Size 49KB
Sample260805-trwpdswwas
SHA256 a39812185d2dca1b9bc0c299771f37e35d51cef07f5c7d8fa1e8604eb77d731f
MD5 21241ebd224c0d519741ed1b9353c748
SHA1 e6f8db7bd646ccad569dc2fd5e39612bf96cf0ef
SHA512 2a55ce64813a7e0f3c2ce39c070c316daff7762cc57fd1ddff50e06f74d0a9d37c74eb28189d21cf39e3a3100a26acb6b5242d8ce427c7fcbaee8f39fae0b4ed
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2N:VLy2Kerc64CiGImVucp4kojWh2N
TLSH
T10F334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/5324-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000700000000697a-5.dat	family_juko
behavioral2/memory/5324-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3188-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0007000000016b5b-13.dat	family_juko
behavioral2/memory/5396-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5396-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3188	WINWORD.exe
5396	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-1-5-21-2115213192-531537726-3295841909-1000\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
1972	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-05_21241ebd224c0d519741ed1b9353c748_elex_wannacry.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
4296	PING.EXE
1972	cmd.exe
3776	PING.EXE
2488	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3776	PING.EXE
2488	PING.EXE
4296	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5324 wrote to memory of 3188	5324	2026-08-05_21241ebd224c0d519741ed1b9353c748_elex_wannacry.exe	88
PID 3188 wrote to memory of 1972	3188	WINWORD.exe	89
PID 1972 wrote to memory of 3776	1972	cmd.exe	91
PID 1972 wrote to memory of 2488	1972	cmd.exe	92
PID 1972 wrote to memory of 4296	1972	cmd.exe	93
PID 1972 wrote to memory of 5396	1972	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-05_21241ebd224c0d519741ed1b9353c748_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-05_21241ebd224c0d519741ed1b9353c748_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5324
- 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:3188
- - 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\00000661" 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:1972
  - - 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:3776
  - - 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:2488
  - - 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:4296
  - - 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:5396

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

00000661

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000661
Size 49KB
SHA256 5b47892e1b0eb49279c6b094e94d552330c12f46324a80ce894c731d33286180
MD5 d98655a2ba7333152a60d39f7bef4706
SHA1 d9c80d406ae0ed099648fd2f5c3e7c6a9a3e7502
SHA512 2586bf50b6b16c2a01753a6bad923ec8a046d64be6a3dc64f1f64653c693d8efa3f21a6b79673778b252118005846bd1bc80ffd076def7f47d6f137725231890
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2d:VLy2Kerc64CiGImVucp4kojWh2d
TLSH
T114334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 a39812185d2dca1b9bc0c299771f37e35d51cef07f5c7d8fa1e8604eb77d731f
MD5 21241ebd224c0d519741ed1b9353c748
SHA1 e6f8db7bd646ccad569dc2fd5e39612bf96cf0ef
SHA512 2a55ce64813a7e0f3c2ce39c070c316daff7762cc57fd1ddff50e06f74d0a9d37c74eb28189d21cf39e3a3100a26acb6b5242d8ce427c7fcbaee8f39fae0b4ed
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2N:VLy2Kerc64CiGImVucp4kojWh2N
TLSH
T10F334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3188-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5324-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5324-10-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5396-15-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5396-16-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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