juko | 4d4b9882e5f6a63f8c9a6bfa0be36e93776acdfa8bac8b19db3518dd4586fbf9

General

Target
2026-08-05_743c14007293e52e92de51b08beac4bc_elex_wannacry.exe
Size 64KB
Sample260805-k34dyagg55
SHA256 4d4b9882e5f6a63f8c9a6bfa0be36e93776acdfa8bac8b19db3518dd4586fbf9
MD5 743c14007293e52e92de51b08beac4bc
SHA1 347e538c1f319d61b5d857124603dca8e90c8b57
SHA512 e4ad6452b8adf028ed377c8793862c8eea4c9d2caf8dcd83646da2db0ede0755377aaadef7d2d2843ebe8f20269c37ac2716808f10d52cb789d79cc06014c36f
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u2:sLy2Kerc64CiGIm8so282
TLSH
T1D7535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x000700000001b850-4.dat	family_juko
behavioral2/files/0x000d00000001c5d0-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4228	WINWORD.exe
1016	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
808	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-05_743c14007293e52e92de51b08beac4bc_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

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
5924	PING.EXE
2840	PING.EXE
808	cmd.exe
2316	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2316	PING.EXE
5924	PING.EXE
2840	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4868 wrote to memory of 4228	4868	2026-08-05_743c14007293e52e92de51b08beac4bc_elex_wannacry.exe	89
PID 4228 wrote to memory of 808	4228	WINWORD.exe	90
PID 808 wrote to memory of 2316	808	cmd.exe	92
PID 808 wrote to memory of 5924	808	cmd.exe	93
PID 808 wrote to memory of 2840	808	cmd.exe	94
PID 808 wrote to memory of 1016	808	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-05_743c14007293e52e92de51b08beac4bc_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-05_743c14007293e52e92de51b08beac4bc_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4868
- 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:4228
- - 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\00006FB1" 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:808
  - - 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:2316
  - - 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:5924
  - - 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:2840
  - - 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:1016

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

00006FB1

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006FB1
Size 64KB
SHA256 5ecd4eada0c9a724fad3381f9919b501dd49db3c29e635d42196f78e1001b1da
MD5 de2b01f3727c9dfb6e388b600bb40448
SHA1 d68dc90c6dc6fd2cba1c04c996676895cd2739f0
SHA512 046c9e7d5853f391c2a32a29a747da88e21877962e437b99319f84bcf56d1a070b47d7796186c305f5be0cc9de329456b237691f0b645dc2f69ecba0f25aa5e5
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uI:sLy2Kerc64CiGIm8so28I
TLSH
T1E0535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 4d4b9882e5f6a63f8c9a6bfa0be36e93776acdfa8bac8b19db3518dd4586fbf9
MD5 743c14007293e52e92de51b08beac4bc
SHA1 347e538c1f319d61b5d857124603dca8e90c8b57
SHA512 e4ad6452b8adf028ed377c8793862c8eea4c9d2caf8dcd83646da2db0ede0755377aaadef7d2d2843ebe8f20269c37ac2716808f10d52cb789d79cc06014c36f
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u2:sLy2Kerc64CiGIm8so282
TLSH
T1D7535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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