juko | 4a66513c842db2e93b3a9aa12ba062581a2326aad1e22a1820d28c994e3bc486

General

Target
2026-08-10_15b099384c910a76fb36c71aa2abf666_elex_glassworm_wannacry.exe
Size 194KB
Sample260810-s2ps6acl4x
SHA256 4a66513c842db2e93b3a9aa12ba062581a2326aad1e22a1820d28c994e3bc486
MD5 15b099384c910a76fb36c71aa2abf666
SHA1 d427bcf3e57fbd2503b545823d97cb4c4323946d
SHA512 dd2e010a11911dc4ba7f94c58983c82428defd9883775a6c0db18e0c6402587faebbe35c5a4391a4a905545bbadfea540a79d1838baa722fba47fd64664148e2
SSDEEP 3072:8Ly2Kerc64CiGImStfHLREJ5itGNbg5uF1dphh1PBDp9Dwqo/zc/9yH8Ka193eTE:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5Kr
TLSH
T1E4147CDAF7623112C45B0A39A7665F189838EC760393651966C0F16C2C7B8B9832FFDC
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/3256-0-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral2/files/0x000a000000011374-5.dat	family_juko
behavioral2/memory/3256-10-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral2/memory/2548-12-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c49d-13.dat	family_juko
behavioral2/memory/4476-15-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral2/memory/4476-16-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2548	WINWORD.exe
4476	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-1-5-21-2115213192-531537726-3295841909-1000\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
4556	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	2026-08-10_15b099384c910a76fb36c71aa2abf666_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
4556	cmd.exe
2088	PING.EXE
824	PING.EXE
5752	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2088	PING.EXE
824	PING.EXE
5752	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3256 wrote to memory of 2548	3256	2026-08-10_15b099384c910a76fb36c71aa2abf666_elex_glassworm_wannacry.exe	89
PID 2548 wrote to memory of 4556	2548	WINWORD.exe	90
PID 4556 wrote to memory of 2088	4556	cmd.exe	92
PID 4556 wrote to memory of 824	4556	cmd.exe	93
PID 4556 wrote to memory of 5752	4556	cmd.exe	94
PID 4556 wrote to memory of 4476	4556	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-10_15b099384c910a76fb36c71aa2abf666_elex_glassworm_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_15b099384c910a76fb36c71aa2abf666_elex_glassworm_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3256
- 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:2548
- - 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\00003BFE" 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:4556
  - - 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:2088
  - - 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:824
  - - 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:5752
  - - 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:4476

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

00003BFE

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003BFE
Size 194KB
SHA256 c442127195e66b4132cb0ddc1123f882c6d422102a1d78f525829183a87403a2
MD5 6b83945add714d4337422b73c67f385a
SHA1 20d10315dc54e192625d715231dd1d530a9efa0d
SHA512 613e7e98faf0875dd14861a52b6008023bd486d2a4294419b5a0cc46d00b39dd67420f1e9f0f06b9d8817b95a019b6ee2d8cc4fb31ad6ccb3f0a50489d33e7cd
SSDEEP 3072:8Ly2Kerc64CiGImStfHLREJ5itGNbg5uF1dphh1PBDp9Dwqo/zc/9yH8Ka193eTB:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5K6
TLSH
T123147CDAF7623112C45B0A39A7665F189838EC760393651966C0F16C2C7B8B9832FFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 194KB
SHA256 4a66513c842db2e93b3a9aa12ba062581a2326aad1e22a1820d28c994e3bc486
MD5 15b099384c910a76fb36c71aa2abf666
SHA1 d427bcf3e57fbd2503b545823d97cb4c4323946d
SHA512 dd2e010a11911dc4ba7f94c58983c82428defd9883775a6c0db18e0c6402587faebbe35c5a4391a4a905545bbadfea540a79d1838baa722fba47fd64664148e2
SSDEEP 3072:8Ly2Kerc64CiGImStfHLREJ5itGNbg5uF1dphh1PBDp9Dwqo/zc/9yH8Ka193eTE:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5Kr
TLSH
T1E4147CDAF7623112C45B0A39A7665F189838EC760393651966C0F16C2C7B8B9832FFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2548-12-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/3256-0-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/3256-10-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/4476-15-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/4476-16-0x0000000000400000-0x0000000000445000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads