juko | 26ec58a233bb4e06f792a912aafd93100b00bc8af99ebb562f88dc28bcc75d36

General

Target
2026-08-18_aa92c7952a95104b41d0d68cc8e1cde8_elex_wannacry.exe
Size 50KB
Sample260818-26zzcsbh67
SHA256 26ec58a233bb4e06f792a912aafd93100b00bc8af99ebb562f88dc28bcc75d36
MD5 aa92c7952a95104b41d0d68cc8e1cde8
SHA1 80bcf4f2b2a34bc3f98b3461b4b67695b60f811e
SHA512 2646c97f8a5b809b388d201bfae6155263c0f2e897c523a29cdab063c1231cae78f2ec581b464266678f1650205e131ca1f5057871fa59cfa60c227460b070a4
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOZ:tLsF2Kerc64sTiX2IV0DpL8SE9nYOZ
TLSH
T12233291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
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/0x001300000001c4b3-4.dat	family_juko
behavioral2/files/0x000d00000001c5f1-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2776	WINWORD.exe
4360	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
3968	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	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	2026-08-18_aa92c7952a95104b41d0d68cc8e1cde8_elex_wannacry.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
3980	PING.EXE
1576	PING.EXE
3968	cmd.exe
2280	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2280	PING.EXE
3980	PING.EXE
1576	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4168 wrote to memory of 2776	4168	2026-08-18_aa92c7952a95104b41d0d68cc8e1cde8_elex_wannacry.exe	88
PID 2776 wrote to memory of 3968	2776	WINWORD.exe	89
PID 3968 wrote to memory of 2280	3968	cmd.exe	91
PID 3968 wrote to memory of 3980	3968	cmd.exe	92
PID 3968 wrote to memory of 1576	3968	cmd.exe	93
PID 3968 wrote to memory of 4360	3968	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-18_aa92c7952a95104b41d0d68cc8e1cde8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-18_aa92c7952a95104b41d0d68cc8e1cde8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4168
- 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:2776
- - 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\00007959" 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:3968
  - - 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:2280
  - - 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:3980
  - - 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:1576
  - - 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:4360

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

00007959

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007959
Size 50KB
SHA256 cfe34e8d3e4e7149cfe0940dd62eb5d109aaac62047aa41b6cdbe2dee8245c72
MD5 1aed64f1448cee7dd218283a206e40a3
SHA1 756c292a683f72d6ab63d45e1ff89db3233f87a0
SHA512 08183d9d5c9e5de33ca56bf1f25948a49170bdf9d90e9df15359b4819fbc1bb00d68767bef0ede0d69afb252e66401776335d062be082590065003fcdf6b7b44
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOY:tLsF2Kerc64sTiX2IV0DpL8SE9nYOY
TLSH
T1C533291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 26ec58a233bb4e06f792a912aafd93100b00bc8af99ebb562f88dc28bcc75d36
MD5 aa92c7952a95104b41d0d68cc8e1cde8
SHA1 80bcf4f2b2a34bc3f98b3461b4b67695b60f811e
SHA512 2646c97f8a5b809b388d201bfae6155263c0f2e897c523a29cdab063c1231cae78f2ec581b464266678f1650205e131ca1f5057871fa59cfa60c227460b070a4
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOZ:tLsF2Kerc64sTiX2IV0DpL8SE9nYOZ
TLSH
T12233291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
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