juko | 84187d6d908d1248644c539f9e9ee92415eaefd751f0ffb03d1e0308fe9ea59e

General

Target
2026-10-28_29cd2ef59615f78487ae4090c6ca1c69_elex_wannacry.exe
Size 37KB
Sample261030-jv4jasxtd1
SHA256 84187d6d908d1248644c539f9e9ee92415eaefd751f0ffb03d1e0308fe9ea59e
MD5 29cd2ef59615f78487ae4090c6ca1c69
SHA1 c31ac9d1d6cb801a3df9a416f6a22dc8667b12c7
SHA512 f3c42c494bb5650d32edb3834b8c4b50e4fbe975aff57d57e374618bc4b01b39c51a134b6c42383b458a1802d6f8f3ce5b1df9178906212873f6411a219b3625
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaI:3LsF2Kerc64sTiX2IV0Dhuogwf
TLSH
T195035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/5068-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c465-4.dat	family_juko
behavioral2/memory/5068-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5128-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c466-13.dat	family_juko
behavioral2/memory/4156-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4156-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5128	WINWORD.exe
4156	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-1-5-21-1404337215-1550464601-2805570857-1000\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
4160	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	2026-10-28_29cd2ef59615f78487ae4090c6ca1c69_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
3216	PING.EXE
4160	cmd.exe
2396	PING.EXE
5084	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2396	PING.EXE
5084	PING.EXE
3216	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5068 wrote to memory of 5128	5068	2026-10-28_29cd2ef59615f78487ae4090c6ca1c69_elex_wannacry.exe	90
PID 5128 wrote to memory of 4160	5128	WINWORD.exe	91
PID 4160 wrote to memory of 2396	4160	cmd.exe	93
PID 4160 wrote to memory of 5084	4160	cmd.exe	94
PID 4160 wrote to memory of 3216	4160	cmd.exe	95
PID 4160 wrote to memory of 4156	4160	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-28_29cd2ef59615f78487ae4090c6ca1c69_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-28_29cd2ef59615f78487ae4090c6ca1c69_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5068
- 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:5128
- - 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\00000FD4" 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:4160
  - - 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:2396
  - - 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:5084
  - - 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:3216
  - - 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:4156

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

00000FD4

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000FD4
Size 37KB
SHA256 494e63e1a4f96c7d501d580eab0bf7caf368d522914d18d97456092c916348cf
MD5 cb0ca8a3b1f5b51bf65cfe512a1c0860
SHA1 f6f968fe6473853bc617468b0e611ebfa663c580
SHA512 d887c0076aaac3589515135edcaf2415ce6e8dae9e72bc17a0ac3be2912b3bcce43966eaca587455b7352c3a732cd11b97f447de1a7b1c75fcf7a25f0279e475
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa+:3LsF2Kerc64sTiX2IV0Dhuogwh
TLSH
T1B6035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 84187d6d908d1248644c539f9e9ee92415eaefd751f0ffb03d1e0308fe9ea59e
MD5 29cd2ef59615f78487ae4090c6ca1c69
SHA1 c31ac9d1d6cb801a3df9a416f6a22dc8667b12c7
SHA512 f3c42c494bb5650d32edb3834b8c4b50e4fbe975aff57d57e374618bc4b01b39c51a134b6c42383b458a1802d6f8f3ce5b1df9178906212873f6411a219b3625
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaI:3LsF2Kerc64sTiX2IV0Dhuogwf
TLSH
T195035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4156-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4156-17-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/5068-0-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/5068-9-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/5128-12-0x0000000000400000-0x000000000041D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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