juko | 443d88f07bf96e5b2fa534eb0574dcdbb055c4f52543f5fb703d9a7782d0ca44

General

Target
2026-10-22_d50e58cb6c2a8aeae60be9cba9bf012a_elex_glassworm_wannacry.exe
Size 200KB
Sample261023-xc5wasds51
SHA256 443d88f07bf96e5b2fa534eb0574dcdbb055c4f52543f5fb703d9a7782d0ca44
MD5 d50e58cb6c2a8aeae60be9cba9bf012a
SHA1 56b389e0d05d918d617207bd6fe2cf001cbbc262
SHA512 d0b270e2e0b039ffb985cad1b644ba8edb5b8f5526afff35b07f9f975f8a895a16d350c4b163b860dbbb8a4922f9bda35bf9849282c09163ebfd09c509d2fe88
SSDEEP 6144:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5KT6:8kwcEz5dhoyvT6
TLSH
T153148C8AF7623015C55B4639A7AA5F189838EC720393651966C0F16C2C7BCB9872FFDC
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/3604-0-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral2/files/0x000b00000001b84c-4.dat	family_juko
behavioral2/memory/3604-10-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral2/memory/3484-12-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c603-13.dat	family_juko
behavioral2/memory/2468-16-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3484	WINWORD.exe
2468	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-1-5-21-4057491610-3392471755-192832105-1000\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
4328	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	2026-10-22_d50e58cb6c2a8aeae60be9cba9bf012a_elex_glassworm_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
4328	cmd.exe
5252	PING.EXE
4100	PING.EXE
6040	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6040	PING.EXE
5252	PING.EXE
4100	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3604 wrote to memory of 3484	3604	2026-10-22_d50e58cb6c2a8aeae60be9cba9bf012a_elex_glassworm_wannacry.exe	90
PID 3484 wrote to memory of 4328	3484	WINWORD.exe	91
PID 4328 wrote to memory of 5252	4328	cmd.exe	93
PID 4328 wrote to memory of 4100	4328	cmd.exe	94
PID 4328 wrote to memory of 6040	4328	cmd.exe	95
PID 4328 wrote to memory of 2468	4328	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-22_d50e58cb6c2a8aeae60be9cba9bf012a_elex_glassworm_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_d50e58cb6c2a8aeae60be9cba9bf012a_elex_glassworm_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3604
- 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:3484
- - 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\00001F03" 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:4328
  - - 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:5252
  - - 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:4100
  - - 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:6040
  - - 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:2468

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

00001F03

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001F03
Size 200KB
SHA256 d01e6aea92f9a7be811e0dd6ddc5b652b23d9eed0de18a1701d10482ad96468f
MD5 4867e460d64c01f5628af7f677c55bd2
SHA1 fe68d46be9c28fd64e7bb52df65d4dbb357e70e6
SHA512 eb1367fc67e2ae591649e6b45dfdd458b57801c6492a223f2cb775fc71b37be59faa7be67fa6f649c2d2609973d82abd05cc232ae0c43789767dd6bd70011c3a
SSDEEP 6144:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5KTf:8kwcEz5dhoyvTf
TLSH
T128148C8AF7623011C55B4639A7AA5F189838EC720393651966C0F16C2C7BCB9872FFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 200KB
SHA256 443d88f07bf96e5b2fa534eb0574dcdbb055c4f52543f5fb703d9a7782d0ca44
MD5 d50e58cb6c2a8aeae60be9cba9bf012a
SHA1 56b389e0d05d918d617207bd6fe2cf001cbbc262
SHA512 d0b270e2e0b039ffb985cad1b644ba8edb5b8f5526afff35b07f9f975f8a895a16d350c4b163b860dbbb8a4922f9bda35bf9849282c09163ebfd09c509d2fe88
SSDEEP 6144:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5KT6:8kwcEz5dhoyvT6
TLSH
T153148C8AF7623015C55B4639A7AA5F189838EC720393651966C0F16C2C7BCB9872FFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2468-16-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/3484-12-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/3604-0-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/3604-10-0x0000000000400000-0x0000000000445000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads