juko | 8997105dc2f818f0ba9cac23d3322b6d14c8351ba9545b6ce4c274097ad9df6c

General

Target
2026-08-14_15cd94ad89156cab4a1c3614946edad4_elex_wannacry.exe
Size 64KB
Sample260814-b9lyssar71
SHA256 8997105dc2f818f0ba9cac23d3322b6d14c8351ba9545b6ce4c274097ad9df6c
MD5 15cd94ad89156cab4a1c3614946edad4
SHA1 0aa113201d186068dd231c4b25f603c5fbc0b193
SHA512 fadbb5d168fb224d73ce876b50b2900ce0544b953f6e8c499bb0b8d4af3076920de4a96b02ccdc9871b2841a04e1ace4f39dca03b4d6f62fc384680d5fde0fa4
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u+:sLy2Kerc64CiGIm8so28+
TLSH
T1BA535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x001200000001b664-4.dat	family_juko
behavioral2/files/0x000e00000001c678-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4364	WINWORD.exe
1440	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-1-5-21-2246396966-3025826688-3847171515-1000\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
5848	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	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	2026-08-14_15cd94ad89156cab4a1c3614946edad4_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
5848	cmd.exe
4660	PING.EXE
3828	PING.EXE
4148	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4660	PING.EXE
3828	PING.EXE
4148	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5956 wrote to memory of 4364	5956	2026-08-14_15cd94ad89156cab4a1c3614946edad4_elex_wannacry.exe	88
PID 4364 wrote to memory of 5848	4364	WINWORD.exe	89
PID 5848 wrote to memory of 4660	5848	cmd.exe	91
PID 5848 wrote to memory of 3828	5848	cmd.exe	92
PID 5848 wrote to memory of 4148	5848	cmd.exe	93
PID 5848 wrote to memory of 1440	5848	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-14_15cd94ad89156cab4a1c3614946edad4_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-14_15cd94ad89156cab4a1c3614946edad4_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5956
- 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:4364
- - 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\00007628" 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:5848
  - - 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:4660
  - - 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:3828
  - - 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:4148
  - - 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:1440

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

00007628

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007628
Size 64KB
SHA256 eb4152b0e217e8a84ba07893951d7a73facdf0c7c3f5462bc5036bfa131c7503
MD5 8df520c4991d7a3ca2ae4d0e7324be90
SHA1 4812cf7cdfe1d3dafdc71169c0aa6dc1f4c2678d
SHA512 66ba2843a2e002b5750f1ee67fbbe7d3abd6fa22d50a2b9bc9121e5c5c42daeed3c0a4bb216d4d55b827a18bb7e00d1143c5258c037d1bbe44c1e821ff0d0549
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uT:sLy2Kerc64CiGIm8so28T
TLSH
T1DF535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 8997105dc2f818f0ba9cac23d3322b6d14c8351ba9545b6ce4c274097ad9df6c
MD5 15cd94ad89156cab4a1c3614946edad4
SHA1 0aa113201d186068dd231c4b25f603c5fbc0b193
SHA512 fadbb5d168fb224d73ce876b50b2900ce0544b953f6e8c499bb0b8d4af3076920de4a96b02ccdc9871b2841a04e1ace4f39dca03b4d6f62fc384680d5fde0fa4
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u+:sLy2Kerc64CiGIm8so28+
TLSH
T1BA535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads