juko | ba2453bec600427229f04c5ef438275e5b0e3da879a31f6f6b7121d4787b2872

General

Target
2026-08-04_b20a392138d63573b388bc0d355d0888_elex_wannacry.exe
Size 64KB
Sample260804-rwe64acc86
SHA256 ba2453bec600427229f04c5ef438275e5b0e3da879a31f6f6b7121d4787b2872
MD5 b20a392138d63573b388bc0d355d0888
SHA1 053a482103cb1acbc6a94249cb775d80f704a4c5
SHA512 cfcfb0c8b1f23899848542fe09f645eec92c8dfa3d7c450dc5b0e01c1b52a35e3802bff443b53b9505d4b63acb08cf8fb83781b2c08cffcc96ef3b63b70e9dcb
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uR:sLy2Kerc64CiGIm8so28R
TLSH
T189535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x00180000000115ef-4.dat	family_juko
behavioral2/files/0x0007000000016cd1-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5976	WINWORD.exe
4124	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-1-5-21-3989226554-2204910950-1522900112-1000\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
1676	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	2026-08-04_b20a392138d63573b388bc0d355d0888_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
1676	cmd.exe
2432	PING.EXE
4520	PING.EXE
2572	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2572	PING.EXE
2432	PING.EXE
4520	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4760 wrote to memory of 5976	4760	2026-08-04_b20a392138d63573b388bc0d355d0888_elex_wannacry.exe	89
PID 5976 wrote to memory of 1676	5976	WINWORD.exe	90
PID 1676 wrote to memory of 2432	1676	cmd.exe	92
PID 1676 wrote to memory of 4520	1676	cmd.exe	93
PID 1676 wrote to memory of 2572	1676	cmd.exe	94
PID 1676 wrote to memory of 4124	1676	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_b20a392138d63573b388bc0d355d0888_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_b20a392138d63573b388bc0d355d0888_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4760
- 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:5976
- - 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\0000531C" 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:1676
  - - 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:2432
  - - 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:4520
  - - 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:2572
  - - 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:4124

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:2132

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

0000531C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000531C
Size 64KB
SHA256 752e08ece15664aeb93a86361aef1e8166f3acaf3e115330f97c9deb2e5ace7f
MD5 f6acb15d7968c8dcffad676617dd97eb
SHA1 c12376d1609c8b0769f70b1ce58947ddd034bf5e
SHA512 8b0ea7db2f069721b4be6679ef872d0802870c92ac6bc5c210e8d0e349f7d2299043bb488caf20102a5166982f06c48695a27357080861c887e03402ec846be6
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/ur:sLy2Kerc64CiGIm8so28r
TLSH
T160535C2EA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 ba2453bec600427229f04c5ef438275e5b0e3da879a31f6f6b7121d4787b2872
MD5 b20a392138d63573b388bc0d355d0888
SHA1 053a482103cb1acbc6a94249cb775d80f704a4c5
SHA512 cfcfb0c8b1f23899848542fe09f645eec92c8dfa3d7c450dc5b0e01c1b52a35e3802bff443b53b9505d4b63acb08cf8fb83781b2c08cffcc96ef3b63b70e9dcb
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uR:sLy2Kerc64CiGIm8so28R
TLSH
T189535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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