juko | 74d934b6be642fa524baf075fd53d9c7020d8103c0bd53be1c19aabba85279d2

General

Target
2026-08-15_eef6f01bcbd19683f05f134738dad3a8_elex_wannacry.exe
Size 87KB
Sample260815-bdrjeada84
SHA256 74d934b6be642fa524baf075fd53d9c7020d8103c0bd53be1c19aabba85279d2
MD5 eef6f01bcbd19683f05f134738dad3a8
SHA1 e15fc135bd4852ea2eaa5072a392c8960f754e5b
SHA512 e83e95bc92ee3147baa629edb1b061f3744752bb2098ce48727b7a70f1f277166e9252b075913418db002ca9fd2109bfe67052acf5f167eeaff73b74f94cefc9
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpp:2Ly2Kerc64CiGIm1K851YO6EQkwpp
TLSH
T18293A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/1400-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x00170000000115f1-5.dat	family_juko
behavioral2/memory/1400-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3816-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001100000001c4a6-13.dat	family_juko
behavioral2/memory/6052-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/6052-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3816	WINWORD.exe
6052	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-1-5-21-1738198120-2966725515-3980530802-1000\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
4112	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	2026-08-15_eef6f01bcbd19683f05f134738dad3a8_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
1840	PING.EXE
1188	PING.EXE
1616	PING.EXE
4112	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1840	PING.EXE
1188	PING.EXE
1616	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1400 wrote to memory of 3816	1400	2026-08-15_eef6f01bcbd19683f05f134738dad3a8_elex_wannacry.exe	89
PID 3816 wrote to memory of 4112	3816	WINWORD.exe	90
PID 4112 wrote to memory of 1840	4112	cmd.exe	92
PID 4112 wrote to memory of 1188	4112	cmd.exe	93
PID 4112 wrote to memory of 1616	4112	cmd.exe	94
PID 4112 wrote to memory of 6052	4112	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-15_eef6f01bcbd19683f05f134738dad3a8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-15_eef6f01bcbd19683f05f134738dad3a8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1400
- 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:3816
- - 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\000016AD" 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:4112
  - - 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:1840
  - - 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:1188
  - - 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:1616
  - - 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:6052

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

000016AD

Path C:\Users\Admin\AppData\Roaming\Mozilla\000016AD
Size 87KB
SHA256 99eafdec5d2744853b18091a3675c5d4da906c6c402c296a1256deffc35a5606
MD5 8142f443b618002509650af407eae5a4
SHA1 c8c75bd72e6e44e4afc7f2bcbb5a4a6794b88b70
SHA512 0a95340c384c05c40d6e8c7ade3f72a3fd0326ff671bcf57a374f8ab89c8a99673994501867cd7f31d64a8bbb0b087e2fc7e1935c63163b77c826e66a47902c4
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpg:2Ly2Kerc64CiGIm1K851YO6EQkwpg
TLSH
T17B93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 74d934b6be642fa524baf075fd53d9c7020d8103c0bd53be1c19aabba85279d2
MD5 eef6f01bcbd19683f05f134738dad3a8
SHA1 e15fc135bd4852ea2eaa5072a392c8960f754e5b
SHA512 e83e95bc92ee3147baa629edb1b061f3744752bb2098ce48727b7a70f1f277166e9252b075913418db002ca9fd2109bfe67052acf5f167eeaff73b74f94cefc9
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpp:2Ly2Kerc64CiGIm1K851YO6EQkwpp
TLSH
T18293A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1400-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1400-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3816-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/6052-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/6052-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads