juko | e48b77441fab7aef2947a86059762e22d2ea5a438cab8a8cf561240cb19d6ad7

General

Target
2026-08-02_479ab554892119dc1ddebaeb6a14a04b_elex_wannacry.exe
Size 64KB
Sample260802-kp2yysfp41
SHA256 e48b77441fab7aef2947a86059762e22d2ea5a438cab8a8cf561240cb19d6ad7
MD5 479ab554892119dc1ddebaeb6a14a04b
SHA1 8f457b820145a0be3b747da1902ea196c06d7e55
SHA512 a1159cf92c71c3650c55b96a6e4caf99d35a13886bcf658546b0dc3b0be3bb6f0d2379995013caf5dec2319e77817e59e30b8837f95a7f2f9c096a1ed0004964
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uI:sLy2Kerc64CiGIm8so28I
TLSH
T164535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x00080000000187d5-4.dat	family_juko
behavioral2/files/0x001100000001c4fb-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3952	WINWORD.exe
4308	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-1-5-21-1875162379-3804078649-638427191-1000\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
5844	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	2026-08-02_479ab554892119dc1ddebaeb6a14a04b_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
5844	cmd.exe
944	PING.EXE
2728	PING.EXE
5724	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
944	PING.EXE
2728	PING.EXE
5724	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4376 wrote to memory of 3952	4376	2026-08-02_479ab554892119dc1ddebaeb6a14a04b_elex_wannacry.exe	90
PID 3952 wrote to memory of 5844	3952	WINWORD.exe	91
PID 5844 wrote to memory of 944	5844	cmd.exe	93
PID 5844 wrote to memory of 2728	5844	cmd.exe	94
PID 5844 wrote to memory of 5724	5844	cmd.exe	95
PID 5844 wrote to memory of 4308	5844	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-02_479ab554892119dc1ddebaeb6a14a04b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_479ab554892119dc1ddebaeb6a14a04b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4376
- 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:3952
- - 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\00000BD6" 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:5844
  - - 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:944
  - - 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:2728
  - - 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:5724
  - - 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:4308

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

00000BD6

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000BD6
Size 64KB
SHA256 eee68c2539d822299a446dc0d8c6e0135ebc1c68ee441fca639987e93a2861e9
MD5 d29cdb214a092b9d75965dfe902d8aa0
SHA1 7d1d5585aac9c999dc0814d2cb01393ea2b64f37
SHA512 6b3af630c1e54ebc8055e5fcb49318bfef30907d2844aaee374df2080a332c7c01c9932586cbcdd19305ec3423955ac8eabfd198bf17b3b5f522978d34823251
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uX:sLy2Kerc64CiGIm8so28X
TLSH
T109535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 e48b77441fab7aef2947a86059762e22d2ea5a438cab8a8cf561240cb19d6ad7
MD5 479ab554892119dc1ddebaeb6a14a04b
SHA1 8f457b820145a0be3b747da1902ea196c06d7e55
SHA512 a1159cf92c71c3650c55b96a6e4caf99d35a13886bcf658546b0dc3b0be3bb6f0d2379995013caf5dec2319e77817e59e30b8837f95a7f2f9c096a1ed0004964
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uI:sLy2Kerc64CiGIm8so28I
TLSH
T164535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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