juko | f8a06903defd2eca59645de8aaf5065bc3b6aad01e0bbc5705dc10c52818f20e

Analysis

max time kernel
149s
max time network
144s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
10/05/2026, 11:07

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General

Target
2026-05-10_79669b39fbdaa5c34791d49eef6c9963_elex_wannacry.exe
Size 88KB
Sample260510-m77chaet2w
SHA256 f8a06903defd2eca59645de8aaf5065bc3b6aad01e0bbc5705dc10c52818f20e
MD5 79669b39fbdaa5c34791d49eef6c9963
SHA1 e698d11f6256572eee72b3ffd9446c6dbbd8d406
SHA512 b1f2b50043c933b5a087d2af1029c6368013c9239e6eaee988697466bb318bd4fbed3571a6e7d43c9a2d17ec64eb7365c4eb199ff09a11add3a8f997720267e8
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsx:zLy2Kerc64CiGImHc/28wzCBlycJWeea
TLSH
T1B9933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/3048-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000800000000d3f6-5.dat	family_juko
behavioral2/memory/3048-13-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/4968-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x001a00000002b42d-17.dat	family_juko
behavioral2/memory/5032-19-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/5032-20-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4968	WINWORD.exe
5032	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-1-5-21-3119821332-640943685-2562343641-1000\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

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	2026-05-10_79669b39fbdaa5c34791d49eef6c9963_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
4836	cmd.exe
2136	PING.EXE
4600	PING.EXE
4724	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4724	PING.EXE
2136	PING.EXE
4600	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3048 wrote to memory of 4968	3048	2026-05-10_79669b39fbdaa5c34791d49eef6c9963_elex_wannacry.exe	79
PID 4968 wrote to memory of 4836	4968	WINWORD.exe	80
PID 4836 wrote to memory of 2136	4836	cmd.exe	82
PID 4836 wrote to memory of 4600	4836	cmd.exe	83
PID 4836 wrote to memory of 4724	4836	cmd.exe	84
PID 4836 wrote to memory of 5032	4836	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-10_79669b39fbdaa5c34791d49eef6c9963_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-10_79669b39fbdaa5c34791d49eef6c9963_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3048
- 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:4968
- - 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\000044F5" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4836
  - - 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:2136
  - - 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:4600
  - - 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:4724
  - - 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:5032

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000044F5

Path C:\Users\Admin\AppData\Roaming\Mozilla\000044F5
Size 88KB
SHA256 bff6005d6a5b64e5d4fd79c76b0669ade2dab5b052f9d006b382de414c5dedae
MD5 c15384277320a9efae5a637de9d06f6b
SHA1 db8f102a5253082fdd24805cd349e55d7bb68745
SHA512 ca78ae5b2d2433375f697f6543dc809e1fd0b7190373baaa954c52f4e48aae02c59cef24bec55f1dfcccc87d349822fb6c935c945166a7cd702bf141ece2c0c3
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsm:zLy2Kerc64CiGImHc/28wzCBlycJWeeh
TLSH
T14F933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 f8a06903defd2eca59645de8aaf5065bc3b6aad01e0bbc5705dc10c52818f20e
MD5 79669b39fbdaa5c34791d49eef6c9963
SHA1 e698d11f6256572eee72b3ffd9446c6dbbd8d406
SHA512 b1f2b50043c933b5a087d2af1029c6368013c9239e6eaee988697466bb318bd4fbed3571a6e7d43c9a2d17ec64eb7365c4eb199ff09a11add3a8f997720267e8
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsx:zLy2Kerc64CiGImHc/28wzCBlycJWeea
TLSH
T1B9933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3048-0-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/3048-13-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/3048-12-0x0000000002650000-0x000000000279D000-memory.dmp

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memory/4968-16-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/4968-15-0x0000000002690000-0x00000000027DD000-memory.dmp

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memory/5032-19-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/5032-20-0x0000000000400000-0x000000000042A000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads