juko | a5497172ea90d43d179afffa5df23e1f969e6ddfde3e14313d17b6b8be0b2201

General

Target
2026-10-25_a1be63f318b8115ed0f119be15267240_elex_glassworm_wannacry.exe
Size 200KB
Sample261026-wbpx1sbf32
SHA256 a5497172ea90d43d179afffa5df23e1f969e6ddfde3e14313d17b6b8be0b2201
MD5 a1be63f318b8115ed0f119be15267240
SHA1 ccf7b133696b8fbdc2fef4ae1e77d6b1b2720d56
SHA512 09004e7ea8141c08f06781f9df98c4dfdc39bb07ceebbf7df5cc5ba693ddbdac458a607a82c3f6c58f845d022312ed763abd9d006fd598891b777cb2898e935a
SSDEEP 6144:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5KTI:8kwcEz5dhoyvTI
TLSH
T17D148C8AF7623015C55B4639A7AA5F189838EC720393651966C0F16C2C7BCB9872FFDC
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/2656-0-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral2/files/0x000700000001b85a-4.dat	family_juko
behavioral2/memory/2656-10-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral2/memory/5836-12-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c425-13.dat	family_juko
behavioral2/memory/2684-16-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5836	WINWORD.exe
2684	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
5296	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-25_a1be63f318b8115ed0f119be15267240_elex_glassworm_wannacry.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
5296	cmd.exe
1224	PING.EXE
4024	PING.EXE
3028	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4024	PING.EXE
3028	PING.EXE
1224	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2656 wrote to memory of 5836	2656	2026-10-25_a1be63f318b8115ed0f119be15267240_elex_glassworm_wannacry.exe	89
PID 5836 wrote to memory of 5296	5836	WINWORD.exe	90
PID 5296 wrote to memory of 1224	5296	cmd.exe	92
PID 5296 wrote to memory of 4024	5296	cmd.exe	93
PID 5296 wrote to memory of 3028	5296	cmd.exe	94
PID 5296 wrote to memory of 2684	5296	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-25_a1be63f318b8115ed0f119be15267240_elex_glassworm_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-25_a1be63f318b8115ed0f119be15267240_elex_glassworm_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2656
- 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:5836
- - 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\00005D5C" 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:5296
  - - 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:1224
  - - 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:4024
  - - 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:3028
  - - 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:2684

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

00005D5C

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005D5C
Size 200KB
SHA256 a5fcdb574366997d888e2b8637f2389607d6cea5332191a6aba5a9e38770a0a2
MD5 5ade26fe78caa45554df0d25be1f6c23
SHA1 595da0259afbda90ec871f3c50364ce035778ef7
SHA512 daf45681a345d68a530b3900b67552bbe9f3fff8d104aebef1d24064ac41cc415aa48810cebe7762543d392bc855bae4f8e663e90463454e288dbb019ae1f519
SSDEEP 6144:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5KTe:8kwcEz5dhoyvTe
TLSH
T1AE148C8AF7623015C55B4639A7AA5F189838EC720393651966C0F16C2C7BCB9872FFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 200KB
SHA256 a5497172ea90d43d179afffa5df23e1f969e6ddfde3e14313d17b6b8be0b2201
MD5 a1be63f318b8115ed0f119be15267240
SHA1 ccf7b133696b8fbdc2fef4ae1e77d6b1b2720d56
SHA512 09004e7ea8141c08f06781f9df98c4dfdc39bb07ceebbf7df5cc5ba693ddbdac458a607a82c3f6c58f845d022312ed763abd9d006fd598891b777cb2898e935a
SSDEEP 6144:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5KTI:8kwcEz5dhoyvTI
TLSH
T17D148C8AF7623015C55B4639A7AA5F189838EC720393651966C0F16C2C7BCB9872FFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2656-0-0x0000000000400000-0x0000000000445000-memory.dmp

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memory/2656-10-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/2684-16-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/5836-12-0x0000000000400000-0x0000000000445000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads