juko | a9d5723e710a01b8693a956d21e0e88ef1b53d4ef6b0c7b80edb5ca6b5fa0502

General

Target
2026-07-31_e0a7758e97bb3162b898636094ad76b4_elex_glassworm_wannacry.exe
Size 211KB
Sample260731-24p2daab66
SHA256 a9d5723e710a01b8693a956d21e0e88ef1b53d4ef6b0c7b80edb5ca6b5fa0502
MD5 e0a7758e97bb3162b898636094ad76b4
SHA1 489788f83fb6c08c3e4ab8b1db537753c044dfdf
SHA512 c939ea1764326380e0ef59e4ee8150f9a525fbcad90e16c901a2e6df77339476a319b090d2cb0ee26da8151c03f18275a2d8ff5f7d34bd36dc6d1976055b2a6e
SSDEEP 6144:jLy2Kwc64YIK628wzQocJje7RsUmWi5F1hLPBp6qoy:jkwcEO28wzmJje7Rsei5dhoy
TLSH
T1BD246B5AF7A220E5C55A82348ABB4731C634FC2414637B3E1780F6291DB6CA59F1AFDC
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/5844-0-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral2/files/0x001300000001c4d1-5.dat	family_juko
behavioral2/memory/5844-10-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral2/memory/2724-12-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral2/files/0x001300000001c57e-13.dat	family_juko
behavioral2/memory/2368-15-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral2/memory/2368-16-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2724	WINWORD.exe
2368	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-1-5-21-3989226554-2204910950-1522900112-1000\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
2176	cmd.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	2026-07-31_e0a7758e97bb3162b898636094ad76b4_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
1548	PING.EXE
2176	cmd.exe
4892	PING.EXE
4012	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4892	PING.EXE
4012	PING.EXE
1548	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5844 wrote to memory of 2724	5844	2026-07-31_e0a7758e97bb3162b898636094ad76b4_elex_glassworm_wannacry.exe	89
PID 2724 wrote to memory of 2176	2724	WINWORD.exe	90
PID 2176 wrote to memory of 4892	2176	cmd.exe	92
PID 2176 wrote to memory of 4012	2176	cmd.exe	93
PID 2176 wrote to memory of 1548	2176	cmd.exe	94
PID 2176 wrote to memory of 2368	2176	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-31_e0a7758e97bb3162b898636094ad76b4_elex_glassworm_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-31_e0a7758e97bb3162b898636094ad76b4_elex_glassworm_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5844
- 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:2724
- - 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\0000637E" 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:2176
  - - 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:4892
  - - 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:4012
  - - 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:1548
  - - 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
      System Location Discovery: System Language Discovery
      PID:2368

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

0000637E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000637E
Size 211KB
SHA256 a335e52cdb703d786dd8096252243a37e685b4e0b2fd72ac699d0809a6204c92
MD5 d6e34b1c986e1dab5c0c996c9dafca09
SHA1 e1952a7dbd8d379deec5434d7fb7007bc1b5c7c1
SHA512 ef293c4918159b6009bb8fc0d829ef584c1a15f6b7ca02d680d4f7e6d44855f081a9c8377b08b48bda159b0dd046ec734cc3cccf112cb5f4dc6d628cf785f2ec
SSDEEP 6144:jLy2Kwc64YIK628wzQocJje7RsUmWi5F1hLPBp6qof:jkwcEO28wzmJje7Rsei5dhof
TLSH
T111246B5AF7A220E5C55A82348ABB4731C634FC2414637B3E1780F6291DB6CA59F1AFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 211KB
SHA256 a9d5723e710a01b8693a956d21e0e88ef1b53d4ef6b0c7b80edb5ca6b5fa0502
MD5 e0a7758e97bb3162b898636094ad76b4
SHA1 489788f83fb6c08c3e4ab8b1db537753c044dfdf
SHA512 c939ea1764326380e0ef59e4ee8150f9a525fbcad90e16c901a2e6df77339476a319b090d2cb0ee26da8151c03f18275a2d8ff5f7d34bd36dc6d1976055b2a6e
SSDEEP 6144:jLy2Kwc64YIK628wzQocJje7RsUmWi5F1hLPBp6qoy:jkwcEO28wzmJje7Rsei5dhoy
TLSH
T1BD246B5AF7A220E5C55A82348ABB4731C634FC2414637B3E1780F6291DB6CA59F1AFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2368-15-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/2368-16-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/2724-12-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/5844-0-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/5844-10-0x0000000000400000-0x000000000044A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads