juko | 895740e84b0dee15f7ca6baae9c69999921b713bc7a72cdab0d656bd08f0bcd6

General

Target
2026-10-28_5414ff07cf7b662e841dd25847bfa995_elex_wannacry.exe
Size 70KB
Sample261030-e35n4saw4p
SHA256 895740e84b0dee15f7ca6baae9c69999921b713bc7a72cdab0d656bd08f0bcd6
MD5 5414ff07cf7b662e841dd25847bfa995
SHA1 0ff958b6a2e7c7ba3e294b155bbecf0bae858bfe
SHA512 a9d7cb93f716384f741dedb4359bebfa479d5011f4dd3bc3959c56c57abce3d6e9a665aa1eba5dba5cc7eaf1b6866a441db9c64471daf03f981b5c4519fa8a1e
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLows3SE9nYOE:vLy2Kerc64CiGImVuX/N81rRLoD51YOE
TLSH
T1FA633906FB89DBD0F0534570E9560AA4747EACF18E63A51BB744730D2C72B16CF32A9A
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/5860-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000700000001b85c-4.dat	family_juko
behavioral2/memory/5860-10-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/memory/3288-12-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c521-13.dat	family_juko
behavioral2/memory/8-16-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3288	WINWORD.exe
8	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
5212	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	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	2026-10-28_5414ff07cf7b662e841dd25847bfa995_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

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
5212	cmd.exe
4864	PING.EXE
5088	PING.EXE
2216	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5088	PING.EXE
2216	PING.EXE
4864	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5860 wrote to memory of 3288	5860	2026-10-28_5414ff07cf7b662e841dd25847bfa995_elex_wannacry.exe	90
PID 3288 wrote to memory of 5212	3288	WINWORD.exe	91
PID 5212 wrote to memory of 4864	5212	cmd.exe	93
PID 5212 wrote to memory of 5088	5212	cmd.exe	94
PID 5212 wrote to memory of 2216	5212	cmd.exe	95
PID 5212 wrote to memory of 8	5212	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-28_5414ff07cf7b662e841dd25847bfa995_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-28_5414ff07cf7b662e841dd25847bfa995_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5860
- 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:3288
- - 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\000025D4" 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:5212
  - - 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:4864
  - - 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:5088
  - - 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:2216
  - - 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:8

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

000025D4

Path C:\Users\Admin\AppData\Roaming\Mozilla\000025D4
Size 70KB
SHA256 680f2f7ed605b2fad91444e69f76b6d6bf4157306420ac16cf0085423d267e37
MD5 f24b7d0da28db60268cd37da81800fc7
SHA1 6df992ebe8ef3b5095c128ad641cee8a5dc9c0f4
SHA512 9bd0cc85b929c4d850bdaf2ea77f30bc9185908fe488c920da17edde23e9e377086098c114043c5b7f751082103083122b86fdde418f53da736c92686232e646
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLows3SE9nYOT:vLy2Kerc64CiGImVuX/N81rRLoD51YOT
TLSH
T153633906FB89DBD0F0534570E9560AA4747EACF18E63A51BB744730D2C72B16CF32A9A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 70KB
SHA256 895740e84b0dee15f7ca6baae9c69999921b713bc7a72cdab0d656bd08f0bcd6
MD5 5414ff07cf7b662e841dd25847bfa995
SHA1 0ff958b6a2e7c7ba3e294b155bbecf0bae858bfe
SHA512 a9d7cb93f716384f741dedb4359bebfa479d5011f4dd3bc3959c56c57abce3d6e9a665aa1eba5dba5cc7eaf1b6866a441db9c64471daf03f981b5c4519fa8a1e
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLows3SE9nYOE:vLy2Kerc64CiGImVuX/N81rRLoD51YOE
TLSH
T1FA633906FB89DBD0F0534570E9560AA4747EACF18E63A51BB744730D2C72B16CF32A9A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/8-16-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/3288-12-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/5860-0-0x0000000000400000-0x000000000041C000-memory.dmp

Download

memory/5860-10-0x0000000000400000-0x000000000041C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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