juko | f07bda90a187316738fcf6556da81dd6a7b77e6356ee3bb4e16adb6b3fa79861

Analysis

max time kernel
149s
max time network
133s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
19/04/2026, 10:21

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General

Target
2026-04-19_227cfc8dae2535c109e05614657637c0_elex_wannacry.exe
Size 49KB
Sample260419-mdwznsc16w
SHA256 f07bda90a187316738fcf6556da81dd6a7b77e6356ee3bb4e16adb6b3fa79861
MD5 227cfc8dae2535c109e05614657637c0
SHA1 05c9669e5f18e4a06d78e3f3ab48d9f22d9f0d51
SHA512 29ee83dc38e848e90594e69f4ce02a5e01fcdf62f13c704fe40be1e014249bda52ffc482342c6980147f12f4a7a620d6a09f1c03f5ed57287b6d88f7343addb8
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2k:VLy2Kerc64CiGImVu8p4kojWh2k
TLSH
T17B334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/2268-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001300000002ad8a-5.dat	family_juko
behavioral2/memory/2268-13-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2088-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b47d-17.dat	family_juko
behavioral2/memory/3728-19-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3728-22-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2088	WINWORD.exe
3728	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-1-5-21-2397528088-2630719772-1129911217-1000\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	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	2026-04-19_227cfc8dae2535c109e05614657637c0_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
5624	PING.EXE
5348	cmd.exe
4776	PING.EXE
3196	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4776	PING.EXE
3196	PING.EXE
5624	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2268 wrote to memory of 2088	2268	2026-04-19_227cfc8dae2535c109e05614657637c0_elex_wannacry.exe	79
PID 2088 wrote to memory of 5348	2088	WINWORD.exe	80
PID 5348 wrote to memory of 4776	5348	cmd.exe	82
PID 5348 wrote to memory of 3196	5348	cmd.exe	83
PID 5348 wrote to memory of 5624	5348	cmd.exe	84
PID 5348 wrote to memory of 3728	5348	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-04-19_227cfc8dae2535c109e05614657637c0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-19_227cfc8dae2535c109e05614657637c0_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2268
- 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:2088
- - 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\00004FED" 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:5348
  - - 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:4776
  - - 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:3196
  - - 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:5624
  - - 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:3728

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

00004FED

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004FED
Size 49KB
SHA256 3d501202cd5c3e10e27e77d6449adfcfc5da58a0fe95df6d9edd16e70ea36029
MD5 93bbe004e97fd5e30d4c669a7a269036
SHA1 476269f2e3d2023f825584284d8f5b5b74cb47dd
SHA512 2e17899ca7c42a6184da6d96cd7e006d4164fab66309c281d66a0ad9868cafadc5cefc3343ca9ec018843c4dada2adb4e061fa0af4c42ac88968d61593e51091
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2P:VLy2Kerc64CiGImVu8p4kojWh2P
TLSH
T1DC334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 f07bda90a187316738fcf6556da81dd6a7b77e6356ee3bb4e16adb6b3fa79861
MD5 227cfc8dae2535c109e05614657637c0
SHA1 05c9669e5f18e4a06d78e3f3ab48d9f22d9f0d51
SHA512 29ee83dc38e848e90594e69f4ce02a5e01fcdf62f13c704fe40be1e014249bda52ffc482342c6980147f12f4a7a620d6a09f1c03f5ed57287b6d88f7343addb8
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2k:VLy2Kerc64CiGImVu8p4kojWh2k
TLSH
T17B334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2088-15-0x0000000000970000-0x00000000009EC000-memory.dmp

Download

memory/2088-16-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2268-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2268-13-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2268-12-0x0000000000830000-0x00000000008AC000-memory.dmp

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memory/3728-19-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3728-20-0x00000000008A0000-0x000000000091C000-memory.dmp

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memory/3728-21-0x0000000002E30000-0x0000000002E37000-memory.dmp

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memory/3728-22-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3728-25-0x00000000008A0000-0x000000000091C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads