juko | f9b6acf4e8481223f4905cb79fba51a13bcf06d774a60231d6658dd7bd5fbf02

General

Target
2026-08-04_a97acf116daada40a7abfe31fce45c53_elex_glassworm_wannacry.exe
Size 211KB
Sample260804-gnjjfaea34
SHA256 f9b6acf4e8481223f4905cb79fba51a13bcf06d774a60231d6658dd7bd5fbf02
MD5 a97acf116daada40a7abfe31fce45c53
SHA1 2f0891b385cc84132a88e59654c75a3b202318f5
SHA512 900be0b53397924ab15440593131787e3da8511495b91b23c0b8e3c396156085b9f8c647cf2728ec2d7cf6f2361d468d1e6df40f061d537be136ef3ce685c022
SSDEEP 6144:jLy2Kwc64YIK628wzQocJje7RsUmWi5F1hLPBp6qo8:jkwcEO28wzmJje7Rsei5dho8
TLSH
T1C4246B5AF7A220E5C55A82348ABB4731C634FC2414637B3E1780F6291DB6CA59F1AFDC
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/3116-0-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral2/files/0x001000000001b1d0-5.dat	family_juko
behavioral2/memory/3116-10-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral2/memory/5228-12-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5e0-13.dat	family_juko
behavioral2/memory/5476-15-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral2/memory/5476-16-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5228	WINWORD.exe
5476	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-1-5-21-1738198120-2966725515-3980530802-1000\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
4840	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-04_a97acf116daada40a7abfe31fce45c53_elex_glassworm_wannacry.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
4840	cmd.exe
1116	PING.EXE
1152	PING.EXE
1420	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1116	PING.EXE
1152	PING.EXE
1420	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3116 wrote to memory of 5228	3116	2026-08-04_a97acf116daada40a7abfe31fce45c53_elex_glassworm_wannacry.exe	89
PID 5228 wrote to memory of 4840	5228	WINWORD.exe	90
PID 4840 wrote to memory of 1116	4840	cmd.exe	92
PID 4840 wrote to memory of 1152	4840	cmd.exe	93
PID 4840 wrote to memory of 1420	4840	cmd.exe	94
PID 4840 wrote to memory of 5476	4840	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_a97acf116daada40a7abfe31fce45c53_elex_glassworm_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_a97acf116daada40a7abfe31fce45c53_elex_glassworm_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3116
- 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:5228
- - 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\0000278B" 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:4840
  - - 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:1116
  - - 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:1152
  - - 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:1420
  - - 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:5476

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

0000278B

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000278B
Size 211KB
SHA256 e025402ac531b8d2e6d0d5db84a9a0f74dab13a3326eb69cb68b070774e90a44
MD5 382bafaff0f02c07e109ecbfc907efe4
SHA1 3feb45f33ebd87394f16103dc27f600da1d446a2
SHA512 83bc19fa972c058762232570cef55c7475cc9db4dd1ee984d5c57933148a4a8dc4ecb82d2ea56492042672fc9ca02e609478220bd9c6f7309f590e1bbff97d76
SSDEEP 6144:jLy2Kwc64YIK628wzQocJje7RsUmWi5F1hLPBp6qon:jkwcEO28wzmJje7Rsei5dhon
TLSH
T1BC246B5AF7A220E5C55A82348ABB4731C634FC2414637B3E1780F6291DB6CA59F1AFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 211KB
SHA256 f9b6acf4e8481223f4905cb79fba51a13bcf06d774a60231d6658dd7bd5fbf02
MD5 a97acf116daada40a7abfe31fce45c53
SHA1 2f0891b385cc84132a88e59654c75a3b202318f5
SHA512 900be0b53397924ab15440593131787e3da8511495b91b23c0b8e3c396156085b9f8c647cf2728ec2d7cf6f2361d468d1e6df40f061d537be136ef3ce685c022
SSDEEP 6144:jLy2Kwc64YIK628wzQocJje7RsUmWi5F1hLPBp6qo8:jkwcEO28wzmJje7Rsei5dho8
TLSH
T1C4246B5AF7A220E5C55A82348ABB4731C634FC2414637B3E1780F6291DB6CA59F1AFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3116-0-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/3116-10-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/5228-12-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/5476-15-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/5476-16-0x0000000000400000-0x000000000044A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads