juko | 32d5df92f3458820b47c87de895312041e162c0148b700412a2b7ae5fd2dfa53

General

Target
2026-10-21_7081d928967b376e8d8c758126e08f9c_elex_wannacry.exe
Size 222KB
Sample261022-1vmdfsas9q
SHA256 32d5df92f3458820b47c87de895312041e162c0148b700412a2b7ae5fd2dfa53
MD5 7081d928967b376e8d8c758126e08f9c
SHA1 8e8d82e0d2c21b8a96886a75ac9f7261456a4e1f
SHA512 a3a0bd0a11adb5321e84041a7500b22116ad3333cc7dc9b9e3d4a034e69cca016486da9eddf9cae518f02535f2da9da01f401db746939282ab34ade35ea5b8d5
SSDEEP 6144:WLy2Kwc64YIdcoA28wzQocJje7RsxBQOAUoky:WkwcERoA28wzmJje7RsHcUTy
TLSH
T12A245A23B751B4EAC81242348EA68671E771BC701B72BB2FB306B73D1C30945BF65A56
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 6 IoCs

resource	yara_rule
behavioral2/memory/1344-0-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral2/files/0x000800000001b85c-4.dat	family_juko
behavioral2/memory/1344-10-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral2/memory/4664-12-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c58a-13.dat	family_juko
behavioral2/memory/1516-16-0x0000000000400000-0x0000000000438000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4664	WINWORD.exe
1516	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
4288	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\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-21_7081d928967b376e8d8c758126e08f9c_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
4288	cmd.exe
2736	PING.EXE
4576	PING.EXE
760	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2736	PING.EXE
4576	PING.EXE
760	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1344 wrote to memory of 4664	1344	2026-10-21_7081d928967b376e8d8c758126e08f9c_elex_wannacry.exe	90
PID 4664 wrote to memory of 4288	4664	WINWORD.exe	91
PID 4288 wrote to memory of 2736	4288	cmd.exe	93
PID 4288 wrote to memory of 4576	4288	cmd.exe	94
PID 4288 wrote to memory of 760	4288	cmd.exe	95
PID 4288 wrote to memory of 1516	4288	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-21_7081d928967b376e8d8c758126e08f9c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-21_7081d928967b376e8d8c758126e08f9c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1344
- 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:4664
- - 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\00002398" 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:4288
  - - 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:2736
  - - 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:4576
  - - 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:760
  - - 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:1516

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

00002398

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002398
Size 222KB
SHA256 c67255e26f95eccb67c3a744a48bb0e52dec684d72b782057b5e665ef6757e80
MD5 48e5870a2d13609321a181331f6b5312
SHA1 2ff91d41f2aa7014d7954cd45a57741f068ca945
SHA512 382581efdc15c0fb296d726a7b3c5c1a102568e1e8f7abb041ce48d198bc7b146bcaa9442c93795d14631a814c1e1745d59c314d5897c84731945ae1af6de046
SSDEEP 6144:WLy2Kwc64YIdcoA28wzQocJje7RsxBQOAUokQ:WkwcERoA28wzmJje7RsHcUTQ
TLSH
T1CD245A23B751B4EAC81242348EA68671E771BC701B72BB2FB306B73D1C30945BF65A56
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 222KB
SHA256 32d5df92f3458820b47c87de895312041e162c0148b700412a2b7ae5fd2dfa53
MD5 7081d928967b376e8d8c758126e08f9c
SHA1 8e8d82e0d2c21b8a96886a75ac9f7261456a4e1f
SHA512 a3a0bd0a11adb5321e84041a7500b22116ad3333cc7dc9b9e3d4a034e69cca016486da9eddf9cae518f02535f2da9da01f401db746939282ab34ade35ea5b8d5
SSDEEP 6144:WLy2Kwc64YIdcoA28wzQocJje7RsxBQOAUoky:WkwcERoA28wzmJje7RsHcUTy
TLSH
T12A245A23B751B4EAC81242348EA68671E771BC701B72BB2FB306B73D1C30945BF65A56
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1344-0-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/1344-10-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/1516-16-0x0000000000400000-0x0000000000438000-memory.dmp

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memory/4664-12-0x0000000000400000-0x0000000000438000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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