juko | 37ea234fa7142c5ed056130809e3d591090991839669cbc33b9edf968bd63418

General

Target
2026-08-02_2caaa15fd2a9d65827e6c3923f3a97e7_elex_wannacry.exe
Size 48KB
Sample260802-1vs61agd28
SHA256 37ea234fa7142c5ed056130809e3d591090991839669cbc33b9edf968bd63418
MD5 2caaa15fd2a9d65827e6c3923f3a97e7
SHA1 d17b31268f6d992c2b3be7be51109975303fea0d
SHA512 f6b95bdbb666fd1a31ba7aad959b21843f3149ccaa7e8740d6735564c5915b3fca1136098fcbbf3b73109b938f35fcabc1cddeb9eb2c2e46d3ab002c8be0b25a
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8n:bLy2Kerc64CiGImav42j0v
TLSH
T146234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
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/1048-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000a000000019cb5-5.dat	family_juko
behavioral2/memory/1048-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1020-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001000000001c4ca-13.dat	family_juko
behavioral2/memory/2812-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2812-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1020	WINWORD.exe
2812	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
4816	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_2caaa15fd2a9d65827e6c3923f3a97e7_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
4816	cmd.exe
5928	PING.EXE
8	PING.EXE
4232	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5928	PING.EXE
8	PING.EXE
4232	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1048 wrote to memory of 1020	1048	2026-08-02_2caaa15fd2a9d65827e6c3923f3a97e7_elex_wannacry.exe	89
PID 1020 wrote to memory of 4816	1020	WINWORD.exe	90
PID 4816 wrote to memory of 5928	4816	cmd.exe	92
PID 4816 wrote to memory of 8	4816	cmd.exe	93
PID 4816 wrote to memory of 4232	4816	cmd.exe	94
PID 4816 wrote to memory of 2812	4816	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_2caaa15fd2a9d65827e6c3923f3a97e7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_2caaa15fd2a9d65827e6c3923f3a97e7_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1048
- 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:1020
- - 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\00001908" 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:4816
  - - 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:5928
  - - 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:8
  - - 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:4232
  - - 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:2812

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

00001908

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001908
Size 48KB
SHA256 42a223b2846d560309a269334f17f5370d50312c94652e0492c7d5a3b36cb6f3
MD5 1b9c880cb376d4bec2b940e1a769d16d
SHA1 62798b19abf9bbe857f63169d87efaeb7bc0bae6
SHA512 c04d91f111e8c08881d510be2cf549d8054f5ae232c11fe42e6a2ab16d733d1a9f83670f8a43c01d952eadf007794a7fec9ef752ec6ea6610a68691f87945dfd
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8y:bLy2Kerc64CiGImav42j06
TLSH
T198234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 48KB
SHA256 37ea234fa7142c5ed056130809e3d591090991839669cbc33b9edf968bd63418
MD5 2caaa15fd2a9d65827e6c3923f3a97e7
SHA1 d17b31268f6d992c2b3be7be51109975303fea0d
SHA512 f6b95bdbb666fd1a31ba7aad959b21843f3149ccaa7e8740d6735564c5915b3fca1136098fcbbf3b73109b938f35fcabc1cddeb9eb2c2e46d3ab002c8be0b25a
SSDEEP 1536:bLsF2Kerc64sTiX2IV0DWvir2jaFBZ0/v8n:bLy2Kerc64CiGImav42j0v
TLSH
T146234A2EB5A26068C55390B0E9EA3E31D4357C75013B752AA700BB252E76E23CF77D8D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1020-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1048-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1048-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2812-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2812-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads