juko | 8b47050a8a7c5eb54495e32cfe368d55026a09549ea24a1351fb35a3ecf95d07

Analysis

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

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
25/04/2026, 03:28

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General

Target
2026-04-25_d40775f810081a8d59838f4dde54cc57_elex_wannacry.exe
Size 48KB
Sample260425-d1jheses8y
SHA256 8b47050a8a7c5eb54495e32cfe368d55026a09549ea24a1351fb35a3ecf95d07
MD5 d40775f810081a8d59838f4dde54cc57
SHA1 236e163e09c8b3fcced549ff3b559a43d210f189
SHA512 b27bde55ceeaf1e5cf89a8e2810040772a22250b342d99690930a4c0def5aa3055e1bb3c86bcc19fc7d9f24058998c86775a8646e05320343a1efa760e834ee2
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8A:bLy2Kerc64CiGImav42j0I
TLSH
T1F6234A2EB5A26068C55390B0E9EA3E31D4357C75013B712AA700BB252E76E23CF77D8D
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/2648-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x00140000000256dc-5.dat	family_juko
behavioral2/memory/2648-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4640-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b3b0-17.dat	family_juko
behavioral2/memory/4516-19-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4516-28-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4640	WINWORD.exe
4516	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-1-5-21-3847269522-1618051987-1942096715-1000\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	2026-04-25_d40775f810081a8d59838f4dde54cc57_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
3692	cmd.exe
4368	PING.EXE
3808	PING.EXE
4692	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4368	PING.EXE
3808	PING.EXE
4692	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2648 wrote to memory of 4640	2648	2026-04-25_d40775f810081a8d59838f4dde54cc57_elex_wannacry.exe	80
PID 4640 wrote to memory of 3692	4640	WINWORD.exe	81
PID 3692 wrote to memory of 4368	3692	cmd.exe	83
PID 3692 wrote to memory of 3808	3692	cmd.exe	84
PID 3692 wrote to memory of 4692	3692	cmd.exe	85
PID 3692 wrote to memory of 4516	3692	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-04-25_d40775f810081a8d59838f4dde54cc57_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-25_d40775f810081a8d59838f4dde54cc57_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2648
- 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:4640
- - 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\00000F4D" 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:3692
  - - 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:4368
  - - 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:3808
  - - 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:4692
  - - 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:4516

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

00000F4D

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000F4D
Size 48KB
SHA256 b4f85629815999540afda5218b933c9c17dd97576092c1364a7aef34a6ac4b63
MD5 ddf7b59fb58e2dc394f6057157ede861
SHA1 461fe0a1da99609343bb3977b9541bd839ca5d73
SHA512 2f615d07519cdf54b7779eff0df86f9262ba4cfed310f52376e6784b4ed2f50660e6c2a21c400ee208f4c7ab7b2d2275d81c4403599c4a5300343ab7b17e0eb9
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8A:bLy2Kerc64CiGImav42j0Y
TLSH
T151234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 8b47050a8a7c5eb54495e32cfe368d55026a09549ea24a1351fb35a3ecf95d07
MD5 d40775f810081a8d59838f4dde54cc57
SHA1 236e163e09c8b3fcced549ff3b559a43d210f189
SHA512 b27bde55ceeaf1e5cf89a8e2810040772a22250b342d99690930a4c0def5aa3055e1bb3c86bcc19fc7d9f24058998c86775a8646e05320343a1efa760e834ee2
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8A:bLy2Kerc64CiGImav42j0I
TLSH
T1F6234A2EB5A26068C55390B0E9EA3E31D4357C75013B712AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2648-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2648-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2648-11-0x0000000000980000-0x00000000009FB000-memory.dmp

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memory/4516-19-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4516-20-0x0000000000670000-0x00000000006EB000-memory.dmp

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memory/4516-28-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4640-15-0x0000000000980000-0x00000000009FB000-memory.dmp

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memory/4640-16-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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