juko | e5d8e8fd8473dbd8c3ea9ca3e6d70457cbb2b55d586a36f41c39fb9c749e1b2d

General

Target
2026-08-25_ce59a7e39c365ea9dd5ffc70abbe8b91_elex_wannacry.exe
Size 49KB
Sample260826-kl3fbasvgv
SHA256 e5d8e8fd8473dbd8c3ea9ca3e6d70457cbb2b55d586a36f41c39fb9c749e1b2d
MD5 ce59a7e39c365ea9dd5ffc70abbe8b91
SHA1 ebf0e72ead822edccc421e405292b5909a034347
SHA512 0f21a1fe9201c292fc827ecd9bc1b8223b5330c7eaf4e50e35789f55a19b123c6b510639256b6b06b995c1af8e19f36a34e753e9cd18a25f2ac52790bcab042c
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2X:VLy2Kerc64CiGImVu8p4kojWh2X
TLSH
T1F3334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/2532-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0008000000011394-5.dat	family_juko
behavioral2/memory/2532-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3156-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0007000000016cd1-13.dat	family_juko
behavioral2/memory/2080-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2080-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3156	WINWORD.exe
2080	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-1-5-21-3989226554-2204910950-1522900112-1000\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
3476	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	2026-08-25_ce59a7e39c365ea9dd5ffc70abbe8b91_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
1596	PING.EXE
5252	PING.EXE
1388	PING.EXE
3476	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1596	PING.EXE
5252	PING.EXE
1388	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2532 wrote to memory of 3156	2532	2026-08-25_ce59a7e39c365ea9dd5ffc70abbe8b91_elex_wannacry.exe	89
PID 3156 wrote to memory of 3476	3156	WINWORD.exe	90
PID 3476 wrote to memory of 1596	3476	cmd.exe	92
PID 3476 wrote to memory of 5252	3476	cmd.exe	93
PID 3476 wrote to memory of 1388	3476	cmd.exe	94
PID 3476 wrote to memory of 2080	3476	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-25_ce59a7e39c365ea9dd5ffc70abbe8b91_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-25_ce59a7e39c365ea9dd5ffc70abbe8b91_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2532
- 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:3156
- - 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\00004CA7" 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:3476
  - - 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:1596
  - - 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:5252
  - - 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:1388
  - - 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:2080

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

00004CA7

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004CA7
Size 49KB
SHA256 6a0e8aa4ad890764af5cfe34eb329cdc6616566635373f921ca5dd7e1a1d9971
MD5 92fbe84c666e16054d55a56bb19baada
SHA1 9fe4fdbbddec2f1abb119e27801865eecd517b47
SHA512 84a887230495b30902a4663d0b9fb40abdb0a73105f7eaebe29a955d470b246f3af656f1ad7ae5fd2bd3cd21e912acc09f524eb66ec9d026020b9855c2249b54
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2X:VLy2Kerc64CiGImVu8p4kojWh2X
TLSH
T14E334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 e5d8e8fd8473dbd8c3ea9ca3e6d70457cbb2b55d586a36f41c39fb9c749e1b2d
MD5 ce59a7e39c365ea9dd5ffc70abbe8b91
SHA1 ebf0e72ead822edccc421e405292b5909a034347
SHA512 0f21a1fe9201c292fc827ecd9bc1b8223b5330c7eaf4e50e35789f55a19b123c6b510639256b6b06b995c1af8e19f36a34e753e9cd18a25f2ac52790bcab042c
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2X:VLy2Kerc64CiGImVu8p4kojWh2X
TLSH
T1F3334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2080-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2080-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2532-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2532-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3156-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads