juko | 6f4bd71ee8e428153665183ddb4fa46119968b59ffc9c73dcd9937d6651691c6

General

Target
2026-08-13_902a65f16a97d7140bdaa109319cdcd5_elex_wannacry.exe
Size 88KB
Sample260813-wp3e9scd85
SHA256 6f4bd71ee8e428153665183ddb4fa46119968b59ffc9c73dcd9937d6651691c6
MD5 902a65f16a97d7140bdaa109319cdcd5
SHA1 3ae191e9a6267d3d2015a3b1d5281ab901942957
SHA512 6b2d39d64e137ac3dfd08e870a15d278faa9aab50b86feef2799511f2a24f2e50812e0de6418d18ef67999c93588aae9a070a3550a9c1f38ca98983523cf177e
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgro:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193w
TLSH
T162934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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/0x000e00000001c437-4.dat	family_juko
behavioral2/files/0x000e00000001c43b-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1380	WINWORD.exe
2500	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
5428	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-13_902a65f16a97d7140bdaa109319cdcd5_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
5428	cmd.exe
4552	PING.EXE
4260	PING.EXE
5748	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4260	PING.EXE
5748	PING.EXE
4552	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4804 wrote to memory of 1380	4804	2026-08-13_902a65f16a97d7140bdaa109319cdcd5_elex_wannacry.exe	89
PID 1380 wrote to memory of 5428	1380	WINWORD.exe	90
PID 5428 wrote to memory of 4552	5428	cmd.exe	92
PID 5428 wrote to memory of 4260	5428	cmd.exe	93
PID 5428 wrote to memory of 5748	5428	cmd.exe	94
PID 5428 wrote to memory of 2500	5428	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-13_902a65f16a97d7140bdaa109319cdcd5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-13_902a65f16a97d7140bdaa109319cdcd5_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4804
- 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:1380
- - 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\000061A9" 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:5428
  - - 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:4552
  - - 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:4260
  - - 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:5748
  - - 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:2500

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

Replay Monitor

Loading Replay Monitor...

Downloads

000061A9

Path C:\Users\Admin\AppData\Roaming\Mozilla\000061A9
Size 88KB
SHA256 2566f9af7e489102b05f6ac9a7181491e7036384decea60018822680245d9635
MD5 a4137eaef33a2672603ee89259e1eb1b
SHA1 54589acef1cdaef231240f0a4828eebc740460c9
SHA512 33c7294e88422fa9a0dc3caad178f803a90f47a2660c00387d8e037173837e361c13ea98316bc94e4ef25673a27acdbaf2dce2056828fcde09bce804c661df85
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgr0:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193M
TLSH
T1F4934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 6f4bd71ee8e428153665183ddb4fa46119968b59ffc9c73dcd9937d6651691c6
MD5 902a65f16a97d7140bdaa109319cdcd5
SHA1 3ae191e9a6267d3d2015a3b1d5281ab901942957
SHA512 6b2d39d64e137ac3dfd08e870a15d278faa9aab50b86feef2799511f2a24f2e50812e0de6418d18ef67999c93588aae9a070a3550a9c1f38ca98983523cf177e
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgro:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193w
TLSH
T162934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads