juko | bb81c3909bcb1b9d474c4ea83eb5aaa9cd4e2fcab47e18d67f2791885cc82236

General

Target
2026-05-11_02f2d3681f2f3a3a82930a300aacc6bd_elex_wannacry.exe
Size 64KB
Sample260511-raznlse19k
SHA256 bb81c3909bcb1b9d474c4ea83eb5aaa9cd4e2fcab47e18d67f2791885cc82236
MD5 02f2d3681f2f3a3a82930a300aacc6bd
SHA1 2dbe3c67649a2491bb83f2735f641e7e09d2f456
SHA512 6c0e565d3d230b826d4db7946d5f724e73927ac64879cae60755825e3fee104fda1c9da179cd9bd7d5435c5e738b3a1cdf7319b761c04a7902b78988204d6992
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uq:sLy2Kerc64CiGIm8so28q
TLSH
T15F535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x0013000000026154-4.dat	family_juko
behavioral2/files/0x000400000002a772-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5240	WINWORD.exe
4988	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-1-5-21-600123060-2148212387-2211176695-1000\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	2026-05-11_02f2d3681f2f3a3a82930a300aacc6bd_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
6000	PING.EXE
5352	PING.EXE
4864	PING.EXE
5200	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6000	PING.EXE
5352	PING.EXE
4864	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5048 wrote to memory of 5240	5048	2026-05-11_02f2d3681f2f3a3a82930a300aacc6bd_elex_wannacry.exe	79
PID 5240 wrote to memory of 5200	5240	WINWORD.exe	80
PID 5200 wrote to memory of 6000	5200	cmd.exe	82
PID 5200 wrote to memory of 5352	5200	cmd.exe	83
PID 5200 wrote to memory of 4864	5200	cmd.exe	84
PID 5200 wrote to memory of 4988	5200	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-11_02f2d3681f2f3a3a82930a300aacc6bd_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-11_02f2d3681f2f3a3a82930a300aacc6bd_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5048
- 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:5240
- - 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\00007A04" 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:5200
  - - 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:6000
  - - 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:5352
  - - 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:4864
  - - 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:4988

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00007A04

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007A04
Size 64KB
SHA256 038313b776639b4bfb1efd3621e960202f2c9195e87c5c9b51a9798109896c84
MD5 67d3d8f47f8482bfce58c61b7691620a
SHA1 b26bca6c16bf0b5b445a2c7ed4136ac8c2ad85c2
SHA512 03fb4512be50ba8614e39a292bbedb5d2467101c0c1f326e74b4d79d0ea0ce32a946c8360d53e9278ec10cf39c40daa69ebb006325edef93f91cdba225419022
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uZ:sLy2Kerc64CiGIm8so28Z
TLSH
T151535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 bb81c3909bcb1b9d474c4ea83eb5aaa9cd4e2fcab47e18d67f2791885cc82236
MD5 02f2d3681f2f3a3a82930a300aacc6bd
SHA1 2dbe3c67649a2491bb83f2735f641e7e09d2f456
SHA512 6c0e565d3d230b826d4db7946d5f724e73927ac64879cae60755825e3fee104fda1c9da179cd9bd7d5435c5e738b3a1cdf7319b761c04a7902b78988204d6992
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uq:sLy2Kerc64CiGIm8so28q
TLSH
T15F535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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