juko | 45f483246c150f37d39ceb8cd1372b0370cabbf657c8dda04633b42f95789584

General

Target
2026-07-28_5fe5d7545c96c58a46907c42f18f0cd8_elex_wannacry.exe
Size 37KB
Sample260728-jl2cksstdx
SHA256 45f483246c150f37d39ceb8cd1372b0370cabbf657c8dda04633b42f95789584
MD5 5fe5d7545c96c58a46907c42f18f0cd8
SHA1 f0aa1805ee39f6195785750f68715b6994191acd
SHA512 745120ce86ea7f858862ae829b60aa8009031e37eccc4bce8d64bb773fce4700e60fa123cc0d3a8fd135a2bcc8655f1411334380b6a8275a5ce92550ae4fc79a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5yway:3LsF2Kerc64sTiX2IV0Dhuogwh
TLSH
T1D3035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/4428-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000c00000001136a-5.dat	family_juko
behavioral2/memory/4428-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3916-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001000000001c4ac-13.dat	family_juko
behavioral2/memory/2632-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2632-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3916	WINWORD.exe
2632	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-1-5-21-552508041-2681165170-3229858294-1000\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
3132	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	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	2026-07-28_5fe5d7545c96c58a46907c42f18f0cd8_elex_wannacry.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
4764	PING.EXE
4756	PING.EXE
3132	cmd.exe
4072	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4072	PING.EXE
4764	PING.EXE
4756	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4428 wrote to memory of 3916	4428	2026-07-28_5fe5d7545c96c58a46907c42f18f0cd8_elex_wannacry.exe	89
PID 3916 wrote to memory of 3132	3916	WINWORD.exe	90
PID 3132 wrote to memory of 4072	3132	cmd.exe	92
PID 3132 wrote to memory of 4764	3132	cmd.exe	93
PID 3132 wrote to memory of 4756	3132	cmd.exe	94
PID 3132 wrote to memory of 2632	3132	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-28_5fe5d7545c96c58a46907c42f18f0cd8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-28_5fe5d7545c96c58a46907c42f18f0cd8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4428
- 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:3916
- - 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\00007EE3" 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:3132
  - - 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:4072
  - - 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:4764
  - - 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:4756
  - - 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:2632

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

00007EE3

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007EE3
Size 37KB
SHA256 08901fbf3727cf58109f470306ad3a4ea03b61d18f05965e702e2945ff2c990f
MD5 4abfde4d5d6dd946491cacf55feabc68
SHA1 072683fcbac58a52bb82b87a17bcd076a870aae0
SHA512 4fb69e6e00decbf91fd16c156707ffa949d596f323aeb1415519d45a5fa35e396cc9fd82d0b56dc32ed3f30a142a511212a3aea070083e6ccafd0295ab0b6e2f
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaf:3LsF2Kerc64sTiX2IV0Dhuogwg
TLSH
T1B5035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 45f483246c150f37d39ceb8cd1372b0370cabbf657c8dda04633b42f95789584
MD5 5fe5d7545c96c58a46907c42f18f0cd8
SHA1 f0aa1805ee39f6195785750f68715b6994191acd
SHA512 745120ce86ea7f858862ae829b60aa8009031e37eccc4bce8d64bb773fce4700e60fa123cc0d3a8fd135a2bcc8655f1411334380b6a8275a5ce92550ae4fc79a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5yway:3LsF2Kerc64sTiX2IV0Dhuogwh
TLSH
T1D3035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2632-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2632-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3916-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4428-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4428-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads