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 8 IoCs

resource	yara_rule
behavioral1/memory/1672-0-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral1/files/0x001b000000024450-5.dat	family_juko
behavioral1/memory/5112-12-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral1/memory/1672-13-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral1/memory/5112-15-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral1/files/0x0008000000024684-16.dat	family_juko
behavioral1/memory/1676-18-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko
behavioral1/memory/1676-19-0x0000000000400000-0x0000000000445000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	2026-08-10_15b099384c910a76fb36c71aa2abf666_elex_glassworm_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5112	WINWORD.exe
1676	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-1-5-21-2370214745-1838013427-2987045292-1000\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
2632	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
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

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
3792	PING.EXE
1440	PING.EXE
2632	cmd.exe
2020	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2020	PING.EXE
3792	PING.EXE
1440	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1672 wrote to memory of 5112	1672	2026-08-10_15b099384c910a76fb36c71aa2abf666_elex_glassworm_wannacry.exe	85
PID 5112 wrote to memory of 2632	5112	WINWORD.exe	86
PID 2632 wrote to memory of 2020	2632	cmd.exe	88
PID 2632 wrote to memory of 3792	2632	cmd.exe	89
PID 2632 wrote to memory of 1440	2632	cmd.exe	90
PID 2632 wrote to memory of 1676	2632	cmd.exe	91

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1672
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5112
- - 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\0000018C" 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:2632
  - - 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:2020
  - - 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:3792
  - - 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:1440
  - - 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:1676

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

Replay Monitor

Loading Replay Monitor...

Downloads

0000018C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000018C
Size 194KB
SHA256 47adbc3a0bbf7dc7ea6cd1dff36cc91518c9b5b1e9c26c97bc782d6fae2a4a60
MD5 1a722dfd53c114a7831e655fb55886ac
SHA1 019eb3342675d8515d014d8c087c2cf0c3a9fdce
SHA512 6666f0d82fbf25627149c674fb1d294a601999cb62aaabdb5ae9bca4fd0c3caedb3fd4b478d9da80823bdf25b8203ef086d3e815f37084dc14ed2dc7d1eeab14
SSDEEP 3072:8Ly2Kerc64CiGImStfHLREJ5itGNbg5uF1dphh1PBDp9Dwqo/zc/9yH8Ka193eTx:8Ly2Kwc64YIPS5F1hLPBp6qorcbIR5KK
TLSH
T14A147CDAF7623112C55B0A39A7665F189838EC760393651966C0F16C2C7B8B9832FFDC
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/1672-0-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/1672-13-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/1676-18-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/1676-19-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/5112-12-0x0000000000400000-0x0000000000445000-memory.dmp

Download

memory/5112-15-0x0000000000400000-0x0000000000445000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads