juko | 8189c35126c8726adf843c2850c0c8fbac8c03ea0df1677fc4e07bcd69d318ce

General

Target
2026-10-08_0075a178d14fbcdb5d1edddb832c271f_elex_wannacry.exe
Size 32KB
Sample261009-2fpqpsft8x
SHA256 8189c35126c8726adf843c2850c0c8fbac8c03ea0df1677fc4e07bcd69d318ce
MD5 0075a178d14fbcdb5d1edddb832c271f
SHA1 863911278d10f2564c31a4c9cd9bd2826e432128
SHA512 ef7d4d34c444e03506573dbbe88c95913ec5f3c7cdcc1f84f795f882b4e86b6896040dd8268c1d0ef52f4364d186e0eae0e472e9dc575af00af5549a18d666f7
SSDEEP 768:AUZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpR:AYLsF2Kerc64sTiX2IV0DhuR
TLSH
T1ACE2293B2A617052C59220B0F9991F348D7D4CB7116BB066FB417A6928B2D63CF70DDE
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/0x000a000000019cb3-3.dat	family_juko
behavioral2/files/0x001200000001c564-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4940	WINWORD.exe
4356	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-1-5-21-53044966-3830981193-2402648431-1000\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
6064	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	2026-10-08_0075a178d14fbcdb5d1edddb832c271f_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
3572	PING.EXE
2044	PING.EXE
1992	PING.EXE
6064	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3572	PING.EXE
2044	PING.EXE
1992	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 848 wrote to memory of 4940	848	2026-10-08_0075a178d14fbcdb5d1edddb832c271f_elex_wannacry.exe	89
PID 4940 wrote to memory of 6064	4940	WINWORD.exe	90
PID 6064 wrote to memory of 3572	6064	cmd.exe	92
PID 6064 wrote to memory of 2044	6064	cmd.exe	93
PID 6064 wrote to memory of 1992	6064	cmd.exe	94
PID 6064 wrote to memory of 4356	6064	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-08_0075a178d14fbcdb5d1edddb832c271f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-08_0075a178d14fbcdb5d1edddb832c271f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:848
- 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:4940
- - 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\00005992" 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:6064
  - - 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:3572
  - - 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:2044
  - - 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:1992
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:4356

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00005992

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005992
Size 32KB
SHA256 c3f15a58c4a3377bee9e2f5b5403babc8575daa83744d8cf3cf70b2f1a9a11f9
MD5 eaba832748be12bd2ac89321f453222c
SHA1 4369cb699454a39c574e1d48ead48165aa8935f2
SHA512 6a85de63ae16223e17ff4e03c6d5c800908cafff8ee2935f46c0b683621e2ca3bd85116c1ac67aa9ad1d039b517465b74a092d09d6bdeaa9e3742106e8d13bd4
SSDEEP 768:AUZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpa:AYLsF2Kerc64sTiX2IV0Dhua
TLSH
T1BDE2293B2AA17052C59220B0F9991F348D7D4CB7116BB066FB417A6928B2D63CF70DDE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 8189c35126c8726adf843c2850c0c8fbac8c03ea0df1677fc4e07bcd69d318ce
MD5 0075a178d14fbcdb5d1edddb832c271f
SHA1 863911278d10f2564c31a4c9cd9bd2826e432128
SHA512 ef7d4d34c444e03506573dbbe88c95913ec5f3c7cdcc1f84f795f882b4e86b6896040dd8268c1d0ef52f4364d186e0eae0e472e9dc575af00af5549a18d666f7
SSDEEP 768:AUZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpR:AYLsF2Kerc64sTiX2IV0DhuR
TLSH
T1ACE2293B2A617052C59220B0F9991F348D7D4CB7116BB066FB417A6928B2D63CF70DDE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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