juko | 1f8fde544665006491f522d88b46e6f0b694fba8a20e2bd1d620fe68f5df3e34

Analysis

max time kernel
149s
max time network
147s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
11/05/2026, 04:41

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General

Target
2026-05-11_6e7dc56a008f9479ec3fd0af54bcb2ac_elex_wannacry.exe
Size 88KB
Sample260511-fa3vgsey3m
SHA256 1f8fde544665006491f522d88b46e6f0b694fba8a20e2bd1d620fe68f5df3e34
MD5 6e7dc56a008f9479ec3fd0af54bcb2ac
SHA1 fabfc6a8495b8a30ec87a146b4fe5d43f9427ff1
SHA512 99c0694a22116a3fa9690210b0b3029b1f1f0d11c0aa658456163a8ca5bafa877ae8844d708210dbd142fc6ea388a895523a41abeed5ce89e98d22fb63d793d8
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsW:zLy2Kerc64CiGImHc/28wzCBlycJWeeN
TLSH
T16F933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/1056-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x001300000001047e-5.dat	family_juko
behavioral2/memory/1056-13-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/2704-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b3d7-17.dat	family_juko
behavioral2/memory/4724-19-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/4724-28-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2704	WINWORD.exe
4724	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-11_6e7dc56a008f9479ec3fd0af54bcb2ac_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
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

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
4756	cmd.exe
2576	PING.EXE
3300	PING.EXE
4344	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2576	PING.EXE
3300	PING.EXE
4344	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1056 wrote to memory of 2704	1056	2026-05-11_6e7dc56a008f9479ec3fd0af54bcb2ac_elex_wannacry.exe	79
PID 2704 wrote to memory of 4756	2704	WINWORD.exe	80
PID 4756 wrote to memory of 2576	4756	cmd.exe	82
PID 4756 wrote to memory of 3300	4756	cmd.exe	83
PID 4756 wrote to memory of 4344	4756	cmd.exe	84
PID 4756 wrote to memory of 4724	4756	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-11_6e7dc56a008f9479ec3fd0af54bcb2ac_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-11_6e7dc56a008f9479ec3fd0af54bcb2ac_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1056
- 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:2704
- - 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\000061B3" 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:4756
  - - 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:2576
  - - 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:3300
  - - 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:4344
  - - 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:4724

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

000061B3

Path C:\Users\Admin\AppData\Roaming\Mozilla\000061B3
Size 88KB
SHA256 4b026c16bdf1532d19d515b426ed9903af55e555f57cd7bf2d7b72bfe66cd701
MD5 c03f78c9eea373b0535196005ee09dea
SHA1 24fa74e26c0c89eef146914d867c50a2caaa90d2
SHA512 1ba55e90c27bcfd735ad568e49e8cc2197b94279a593c3e346c6d2a7a0fea19539a52b1842a97d65f22729f538b7a3202f9f738f3dcdca90a2f5457a8448b237
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsW:zLy2Kerc64CiGImHc/28wzCBlycJWeet
TLSH
T183933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 1f8fde544665006491f522d88b46e6f0b694fba8a20e2bd1d620fe68f5df3e34
MD5 6e7dc56a008f9479ec3fd0af54bcb2ac
SHA1 fabfc6a8495b8a30ec87a146b4fe5d43f9427ff1
SHA512 99c0694a22116a3fa9690210b0b3029b1f1f0d11c0aa658456163a8ca5bafa877ae8844d708210dbd142fc6ea388a895523a41abeed5ce89e98d22fb63d793d8
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsW:zLy2Kerc64CiGImHc/28wzCBlycJWeeN
TLSH
T16F933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1056-0-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/1056-13-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/1056-11-0x00000000008B0000-0x00000000009C2000-memory.dmp

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memory/2704-15-0x0000000000930000-0x0000000000A42000-memory.dmp

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memory/2704-16-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/4724-19-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/4724-20-0x0000000000A20000-0x0000000000B32000-memory.dmp

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memory/4724-22-0x0000000000A20000-0x0000000000B32000-memory.dmp

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memory/4724-28-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/4724-33-0x0000000000A20000-0x0000000000B32000-memory.dmp

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Analysis

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General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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