juko | 46c5d7b7b1d8d807b045c4f8c0881f5ccb84556fa37de310685f20edff27fcde

General

Target
2026-08-17_2eff851c73f3a4ef27e95601e05943cf_elex_wannacry.exe
Size 49KB
Sample260817-ctsl3shb39
SHA256 46c5d7b7b1d8d807b045c4f8c0881f5ccb84556fa37de310685f20edff27fcde
MD5 2eff851c73f3a4ef27e95601e05943cf
SHA1 6f510611ba9dd2297e309895adadce4805240f0a
SHA512 87f629c1631593c11b1e3c9e5cc2ecdb197999ca9c950ee88b550868f7a8c6eac6399f55d299890185959b0860ee3a4736b063e3b95503adb7b94e2601eca952
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2p:VLy2Kerc64CiGImVucp4kojWh2p
TLSH
T174334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/4388-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b00000001136f-5.dat	family_juko
behavioral2/memory/4388-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4792-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c532-13.dat	family_juko
behavioral2/memory/4468-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4468-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4792	WINWORD.exe
4468	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-1-5-21-3986082593-3624157295-3514260330-1000\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
4940	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	2026-08-17_2eff851c73f3a4ef27e95601e05943cf_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
4940	cmd.exe
4396	PING.EXE
1324	PING.EXE
5556	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4396	PING.EXE
1324	PING.EXE
5556	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4388 wrote to memory of 4792	4388	2026-08-17_2eff851c73f3a4ef27e95601e05943cf_elex_wannacry.exe	89
PID 4792 wrote to memory of 4940	4792	WINWORD.exe	90
PID 4940 wrote to memory of 4396	4940	cmd.exe	92
PID 4940 wrote to memory of 1324	4940	cmd.exe	93
PID 4940 wrote to memory of 5556	4940	cmd.exe	94
PID 4940 wrote to memory of 4468	4940	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-17_2eff851c73f3a4ef27e95601e05943cf_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-17_2eff851c73f3a4ef27e95601e05943cf_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4388
- 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:4792
- - 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\000053AD" 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:4940
  - - 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:4396
  - - 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:1324
  - - 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:5556
  - - 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:4468

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

000053AD

Path C:\Users\Admin\AppData\Roaming\Mozilla\000053AD
Size 49KB
SHA256 384af896f9320642056e1d024aeec8ab3fa12c82fe042ae8a5d9475875e74a4d
MD5 d9accc8a5d34e64634c6bd55e280b3c9
SHA1 c0f2cc58d8ae214518ae622fd8847c6f76858ac0
SHA512 73e383df5d231fab95b54bc3fc6ca4fbe672a69bb7d1e12be4082f29d48940309e0955f2fdeb55636b7eb67bce037ec5221a07f6b6f9cac08eec55c8afbbdc06
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2Q:VLy2Kerc64CiGImVucp4kojWh2Q
TLSH
T13F334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 46c5d7b7b1d8d807b045c4f8c0881f5ccb84556fa37de310685f20edff27fcde
MD5 2eff851c73f3a4ef27e95601e05943cf
SHA1 6f510611ba9dd2297e309895adadce4805240f0a
SHA512 87f629c1631593c11b1e3c9e5cc2ecdb197999ca9c950ee88b550868f7a8c6eac6399f55d299890185959b0860ee3a4736b063e3b95503adb7b94e2601eca952
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2p:VLy2Kerc64CiGImVucp4kojWh2p
TLSH
T174334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4388-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4388-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4468-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4468-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4792-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads