juko | 19f181619c90281dc6d61ca8920ebdd016dcec70aa89922d553fad7b7d4377de

General

Target
2026-07-20_9c6dc834157e425aa9630ce0f08d3b8d_elex_wannacry.exe
Size 39KB
Sample260720-c96tmsfx4v
SHA256 19f181619c90281dc6d61ca8920ebdd016dcec70aa89922d553fad7b7d4377de
MD5 9c6dc834157e425aa9630ce0f08d3b8d
SHA1 9476485de7607339d806715dc90c3b81f6e5b71c
SHA512 c195272120de2d7bab271b785fd2597e366da2cfa92943bb811072d9deeceb0f790e6b494152b5d04f0bc447763c2745d95a8aba656a36741c7dffc2d5234982
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBv:aLsF2Kerc64sTiX2IV0DVyIGFk
TLSH
T106036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/3476-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x0011000000016ce7-5.dat	family_juko
behavioral2/memory/3476-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4052-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c5b1-13.dat	family_juko
behavioral2/memory/3432-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3432-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4052	WINWORD.exe
3432	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
4500	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	2026-07-20_9c6dc834157e425aa9630ce0f08d3b8d_elex_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

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
4500	cmd.exe
3420	PING.EXE
5156	PING.EXE
3540	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5156	PING.EXE
3540	PING.EXE
3420	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3476 wrote to memory of 4052	3476	2026-07-20_9c6dc834157e425aa9630ce0f08d3b8d_elex_wannacry.exe	88
PID 4052 wrote to memory of 4500	4052	WINWORD.exe	89
PID 4500 wrote to memory of 3420	4500	cmd.exe	91
PID 4500 wrote to memory of 5156	4500	cmd.exe	92
PID 4500 wrote to memory of 3540	4500	cmd.exe	93
PID 4500 wrote to memory of 3432	4500	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-20_9c6dc834157e425aa9630ce0f08d3b8d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-20_9c6dc834157e425aa9630ce0f08d3b8d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3476
- 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:4052
- - 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\00007732" 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:4500
  - - 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:3420
  - - 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:5156
  - - 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:3540
  - - 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:3432

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:2972

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

00007732

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007732
Size 39KB
SHA256 e10ff74b5f04cbfa8c20b9e51cfa902e2171db08effaa64752de7e08c0769913
MD5 a2db470034a81b5e531a7923cda8ab4a
SHA1 7031534fabb8b6a845984fe00a3d63667d633df1
SHA512 2b9c04e9a8631aef7c12b2ea49a77862334bfd23ffd2f102ea198a6a5a597750db3776512e9bd68ced2aab5710dcdbb458ca64fc32c3a072ca3372ccb972574b
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBG:aLsF2Kerc64sTiX2IV0DVyIGFp
TLSH
T14D036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 19f181619c90281dc6d61ca8920ebdd016dcec70aa89922d553fad7b7d4377de
MD5 9c6dc834157e425aa9630ce0f08d3b8d
SHA1 9476485de7607339d806715dc90c3b81f6e5b71c
SHA512 c195272120de2d7bab271b785fd2597e366da2cfa92943bb811072d9deeceb0f790e6b494152b5d04f0bc447763c2745d95a8aba656a36741c7dffc2d5234982
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBv:aLsF2Kerc64sTiX2IV0DVyIGFk
TLSH
T106036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3432-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3432-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3476-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3476-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4052-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads