juko | f33741478f93c042a69fad8bb061a69ec094480f204a538e32d5bab2c1bcd5b5

General

Target
2026-10-04_ec7e14529650099e0d85fdcab4702fef_elex_wannacry.exe
Size 137KB
Sample261004-2tfd7ayflh
SHA256 f33741478f93c042a69fad8bb061a69ec094480f204a538e32d5bab2c1bcd5b5
MD5 ec7e14529650099e0d85fdcab4702fef
SHA1 cace813b027a3e48e6b00579e2486d359492265b
SHA512 e0e3268f11761232d2f41e50bfaa9ceddd1529f09ae8bdd2eb1f2fb7d1baa9f4ed11f24d41e2b995a373f7e919496c121fd6d0ba84f945cf087259b7b00763d7
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGg5:+Ly2Kwc64YIcYjIDLCSiDaQm
TLSH
T18DD30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
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/820-0-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x000d00000001b8b0-4.dat	family_juko
behavioral2/memory/820-9-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/4296-12-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c5f7-13.dat	family_juko
behavioral2/memory/5928-16-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/5928-17-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4296	WINWORD.exe
5928	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-1-5-21-1262770251-41185387-1005173349-1000\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
2860	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.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	2026-10-04_ec7e14529650099e0d85fdcab4702fef_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
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
2860	cmd.exe
3680	PING.EXE
3168	PING.EXE
5964	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3680	PING.EXE
3168	PING.EXE
5964	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 820 wrote to memory of 4296	820	2026-10-04_ec7e14529650099e0d85fdcab4702fef_elex_wannacry.exe	90
PID 4296 wrote to memory of 2860	4296	WINWORD.exe	91
PID 2860 wrote to memory of 3680	2860	cmd.exe	93
PID 2860 wrote to memory of 3168	2860	cmd.exe	94
PID 2860 wrote to memory of 5964	2860	cmd.exe	95
PID 2860 wrote to memory of 5928	2860	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-04_ec7e14529650099e0d85fdcab4702fef_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-04_ec7e14529650099e0d85fdcab4702fef_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:820
- 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:4296
- - 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\00003B0B" 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:2860
  - - 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:3680
  - - 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:3168
  - - 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:5964
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:5928

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00003B0B

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003B0B
Size 137KB
SHA256 fdf26c260b15c46997e6dc715199589f8bf6bb3f8291372336be44bed9490183
MD5 5364ed13d418e03812be0552d49bae73
SHA1 f9581da298828145b2d67f5a6e05aedc0a74e7b7
SHA512 1c05057a08135233d6958c6b29d36d704b31c376e68de51963abd5e5783ce87b6ee8f6baecc70dbb82d19d8f6d99bf036499698dba2d757e90989520731cbf5d
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGg9:+Ly2Kwc64YIcYjIDLCSiDaQW
TLSH
T15ED30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 137KB
SHA256 f33741478f93c042a69fad8bb061a69ec094480f204a538e32d5bab2c1bcd5b5
MD5 ec7e14529650099e0d85fdcab4702fef
SHA1 cace813b027a3e48e6b00579e2486d359492265b
SHA512 e0e3268f11761232d2f41e50bfaa9ceddd1529f09ae8bdd2eb1f2fb7d1baa9f4ed11f24d41e2b995a373f7e919496c121fd6d0ba84f945cf087259b7b00763d7
SSDEEP 3072:+Ly2Kerc64CiGImRRL0tU+3ZZYRGILCSihxnQDhGg5:+Ly2Kwc64YIcYjIDLCSiDaQm
TLSH
T18DD30A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/820-0-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/820-9-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4296-12-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/5928-16-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/5928-17-0x0000000000400000-0x0000000000436000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads