juko | 64e8698bc5715845d9747093853a633fb68202df29ac8739048cc9f8de818722

General

Target
2026-08-30_c87b12046c4501c91b4de34f81e2db7a_elex_wannacry.exe
Size 87KB
Sample260831-e9kmhsef74
SHA256 64e8698bc5715845d9747093853a633fb68202df29ac8739048cc9f8de818722
MD5 c87b12046c4501c91b4de34f81e2db7a
SHA1 16c60c2bfaf5cb549b4fb9ca2f610e22cc9a549d
SHA512 62c1403503f61f15cf1789591b49d1a0d8a0a3ed79d355df75b10dcac3d8340ae1fea9605dd80d7fefcf37f21ab23ae26be47983324f42041508c8f45c634648
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp1:2Ly2Kerc64CiGIm1K851YO6EQkwp1
TLSH
T19893A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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 7 IoCs

resource	yara_rule
behavioral2/memory/4300-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000c000000019cb8-5.dat	family_juko
behavioral2/memory/4300-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2208-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c533-13.dat	family_juko
behavioral2/memory/4240-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4240-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2208	WINWORD.exe
4240	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
1844	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-30_c87b12046c4501c91b4de34f81e2db7a_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
1844	cmd.exe
4116	PING.EXE
1748	PING.EXE
1180	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4116	PING.EXE
1748	PING.EXE
1180	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4300 wrote to memory of 2208	4300	2026-08-30_c87b12046c4501c91b4de34f81e2db7a_elex_wannacry.exe	88
PID 2208 wrote to memory of 1844	2208	WINWORD.exe	89
PID 1844 wrote to memory of 4116	1844	cmd.exe	91
PID 1844 wrote to memory of 1748	1844	cmd.exe	92
PID 1844 wrote to memory of 1180	1844	cmd.exe	93
PID 1844 wrote to memory of 4240	1844	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-30_c87b12046c4501c91b4de34f81e2db7a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-30_c87b12046c4501c91b4de34f81e2db7a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4300
- 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:2208
- - 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\00005A4A" 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:1844
  - - 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:4116
  - - 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:1748
  - - 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:1180
  - - 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:4240

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

00005A4A

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005A4A
Size 87KB
SHA256 035dde00cebefe78178b5ad74b8b47398a2f7ef06026c11c8c8ad55c1257914c
MD5 bbf2e5fa4198a96b3cc4d6a30fbd1582
SHA1 c632f9870c0ce6ed8c7988a80fc08d3af5ecab04
SHA512 177de30794cc2dbf007b7d3c167c2588aae9d8cbaa6c6b7b6610ae2e45c1808bc1ff957992d8665ec95bdfa8cb0dfe9ec942ec5fd98c288bbc5ce99ed5671c1e
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpB:2Ly2Kerc64CiGIm1K851YO6EQkwpB
TLSH
T14E93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 64e8698bc5715845d9747093853a633fb68202df29ac8739048cc9f8de818722
MD5 c87b12046c4501c91b4de34f81e2db7a
SHA1 16c60c2bfaf5cb549b4fb9ca2f610e22cc9a549d
SHA512 62c1403503f61f15cf1789591b49d1a0d8a0a3ed79d355df75b10dcac3d8340ae1fea9605dd80d7fefcf37f21ab23ae26be47983324f42041508c8f45c634648
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp1:2Ly2Kerc64CiGIm1K851YO6EQkwp1
TLSH
T19893A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2208-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4240-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4240-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4300-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4300-9-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads