juko | 0318f26cbeba27e64f59f3d6e7b10acaf5fccd60df3ff988073b0edf0e881ff6

General

Target
2026-08-18_16b8a7b71be603b55dd5aa78a146c765_elex_wannacry.exe
Size 32KB
Sample260819-ae97gavvft
SHA256 0318f26cbeba27e64f59f3d6e7b10acaf5fccd60df3ff988073b0edf0e881ff6
MD5 16b8a7b71be603b55dd5aa78a146c765
SHA1 c545d1f270be9d0a7cba16509f758d7a81398e3b
SHA512 042414d486d4fe5e3444230b4cb9368c052f26c870da80ac95685c73fd84429c41938d609588cb3a687fb4adc0ccb0fa3e52eee86d9e4ea0f358678b4ada137a
SSDEEP 768:RZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqbNPWQHJn7:bLsF2Kerc64sTiX2IV0DEan7
TLSH
T1D0E22B2B2AA57052C59320B0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ECE
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000e00000001b896-4.dat	family_juko
behavioral2/files/0x000f00000001c4f2-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
6096	WINWORD.exe
4960	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-1-5-21-189034102-168398478-1159367937-1000\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
296	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-18_16b8a7b71be603b55dd5aa78a146c765_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

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
296	cmd.exe
264	PING.EXE
5788	PING.EXE
4580	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
264	PING.EXE
5788	PING.EXE
4580	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5776 wrote to memory of 6096	5776	2026-08-18_16b8a7b71be603b55dd5aa78a146c765_elex_wannacry.exe	89
PID 6096 wrote to memory of 296	6096	WINWORD.exe	90
PID 296 wrote to memory of 264	296	cmd.exe	92
PID 296 wrote to memory of 5788	296	cmd.exe	93
PID 296 wrote to memory of 4580	296	cmd.exe	94
PID 296 wrote to memory of 4960	296	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-18_16b8a7b71be603b55dd5aa78a146c765_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-18_16b8a7b71be603b55dd5aa78a146c765_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5776
- 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:6096
- - 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\00002663" 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:296
  - - 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:264
  - - 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:5788
  - - 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:4580
  - - 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:4960

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

00002663

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002663
Size 32KB
SHA256 ff8800a38607e40d0a77e346d90b69ba4440d51e1753f8149d74b41fbe1e1543
MD5 09d91fb4694fde9cfd083b6165593ac3
SHA1 2f1177f3bbadcce8ebaa8ca663cff24cfbedb7fa
SHA512 a314df3f1951e906e7b1211898cccf408ef482890079f04f40666f4cb1d2a95561670352c9bbb498cbed1a7dbf42fd01f133c2bba291c0c7d968342bc55d04eb
SSDEEP 768:RZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqbNPWQHJnm:bLsF2Kerc64sTiX2IV0DEanm
TLSH
T133E22B2B2AA57052C59320B0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 0318f26cbeba27e64f59f3d6e7b10acaf5fccd60df3ff988073b0edf0e881ff6
MD5 16b8a7b71be603b55dd5aa78a146c765
SHA1 c545d1f270be9d0a7cba16509f758d7a81398e3b
SHA512 042414d486d4fe5e3444230b4cb9368c052f26c870da80ac95685c73fd84429c41938d609588cb3a687fb4adc0ccb0fa3e52eee86d9e4ea0f358678b4ada137a
SSDEEP 768:RZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqbNPWQHJn7:bLsF2Kerc64sTiX2IV0DEan7
TLSH
T1D0E22B2B2AA57052C59320B0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads