juko | f5ad6a1715b3824b63c817926005ca8fcf1a0b39007204516534910d48690ed5

General

Target
2026-08-24_462f5940d81a4e087ca964827eb78b5f_elex_wannacry.exe
Size 64KB
Sample260825-rl6laszwgz
SHA256 f5ad6a1715b3824b63c817926005ca8fcf1a0b39007204516534910d48690ed5
MD5 462f5940d81a4e087ca964827eb78b5f
SHA1 c3e9a5b56a4d851d24b21b9ce3f73e4d91cb6460
SHA512 1614c8e718b7334bca78c8cc2789d61a0435abfa49602f09cf1b009ab26767addc6e106c266a44ae3b3c58249db4da2bd065e7b08273fda5bb4dc9b000fd2522
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uI:sLy2Kerc64CiGIm8so28I
TLSH
T1AB535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x000d00000001b87d-4.dat	family_juko
behavioral2/files/0x000f00000001c44d-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
6024	WINWORD.exe
4708	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-1-5-21-3797332335-34111092-3597280141-1000\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
5044	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	2026-08-24_462f5940d81a4e087ca964827eb78b5f_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
5044	cmd.exe
3088	PING.EXE
2920	PING.EXE
4756	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3088	PING.EXE
2920	PING.EXE
4756	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5840 wrote to memory of 6024	5840	2026-08-24_462f5940d81a4e087ca964827eb78b5f_elex_wannacry.exe	89
PID 6024 wrote to memory of 5044	6024	WINWORD.exe	90
PID 5044 wrote to memory of 3088	5044	cmd.exe	92
PID 5044 wrote to memory of 2920	5044	cmd.exe	93
PID 5044 wrote to memory of 4756	5044	cmd.exe	94
PID 5044 wrote to memory of 4708	5044	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-24_462f5940d81a4e087ca964827eb78b5f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-24_462f5940d81a4e087ca964827eb78b5f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5840
- 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:6024
- - 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\00003197" 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:5044
  - - 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:3088
  - - 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:2920
  - - 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:4756
  - - 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:4708

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

00003197

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003197
Size 64KB
SHA256 c59cad405225fae1934999e6cc2fbf2a9954453572971f11d276e310aa4ef488
MD5 85e43e9d7d07124f197edf7932bd8fe3
SHA1 d83a51bfb05328eb9f4cede1d031660e82bb097a
SHA512 3faf119234deb848680bd38740802c401bc2eb6811cc7fb9cf40096bbdaf875dd67d14be232d71f66529bd5a4937f2a698a686d278ece794e30d049b65ce08ac
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/un:sLy2Kerc64CiGIm8so28n
TLSH
T1A1535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 f5ad6a1715b3824b63c817926005ca8fcf1a0b39007204516534910d48690ed5
MD5 462f5940d81a4e087ca964827eb78b5f
SHA1 c3e9a5b56a4d851d24b21b9ce3f73e4d91cb6460
SHA512 1614c8e718b7334bca78c8cc2789d61a0435abfa49602f09cf1b009ab26767addc6e106c266a44ae3b3c58249db4da2bd065e7b08273fda5bb4dc9b000fd2522
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uI:sLy2Kerc64CiGIm8so28I
TLSH
T1AB535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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