juko | d20011647790025452baee18364743078b1b0f5b6049cdd3b4b22bfc1c262c3e

General

Target
2026-08-03_a29a5b918a7534d5969022ad375fe1a8_elex_wannacry.exe
Size 64KB
Sample260803-kydbyssemf
SHA256 d20011647790025452baee18364743078b1b0f5b6049cdd3b4b22bfc1c262c3e
MD5 a29a5b918a7534d5969022ad375fe1a8
SHA1 5ebba691d14058dc16803d581a9d1449244738f6
SHA512 6d9dffcc7612dae53dda4f79ae39fa4b9d786452d17f3fa53b8a42fcd5e12552b916d6161ef4ad7d37ca07483059f47a20903b05e24c8f3407f27d298db3e6de
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/ug:sLy2Kerc64CiGIm8so28g
TLSH
T1BD535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x000e00000001c5b9-4.dat	family_juko
behavioral2/files/0x000e00000001c5ba-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4256	WINWORD.exe
2072	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-1-5-21-1738198120-2966725515-3980530802-1000\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
3580	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	2026-08-03_a29a5b918a7534d5969022ad375fe1a8_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.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
1132	PING.EXE
5284	PING.EXE
3580	cmd.exe
3584	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5284	PING.EXE
3584	PING.EXE
1132	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5672 wrote to memory of 4256	5672	2026-08-03_a29a5b918a7534d5969022ad375fe1a8_elex_wannacry.exe	89
PID 4256 wrote to memory of 3580	4256	WINWORD.exe	90
PID 3580 wrote to memory of 3584	3580	cmd.exe	92
PID 3580 wrote to memory of 1132	3580	cmd.exe	93
PID 3580 wrote to memory of 5284	3580	cmd.exe	94
PID 3580 wrote to memory of 2072	3580	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-03_a29a5b918a7534d5969022ad375fe1a8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_a29a5b918a7534d5969022ad375fe1a8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5672
- 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:4256
- - 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\00006C79" 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:3580
  - - 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:3584
  - - 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:1132
  - - 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:5284
  - - 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:2072

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

00006C79

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006C79
Size 64KB
SHA256 cb70fa604f92a3660a863833237ca6f5b57831f99c98db7facab1cbac246504d
MD5 ae391d49c32ef1176aeb82b0ae20a02a
SHA1 05eb10d88023948c5fbccd61243e66cbca48aaf1
SHA512 df255e8ae3b6fc3e03a2c6006a6052b26778610f3bfc8a4752601ebbd78dc2fa17c06aa741940d347eab907420cc32abe1985e9888763afc44e00a293e94d189
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/ux:sLy2Kerc64CiGIm8so28x
TLSH
T184535C2AA5A220F8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 d20011647790025452baee18364743078b1b0f5b6049cdd3b4b22bfc1c262c3e
MD5 a29a5b918a7534d5969022ad375fe1a8
SHA1 5ebba691d14058dc16803d581a9d1449244738f6
SHA512 6d9dffcc7612dae53dda4f79ae39fa4b9d786452d17f3fa53b8a42fcd5e12552b916d6161ef4ad7d37ca07483059f47a20903b05e24c8f3407f27d298db3e6de
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/ug:sLy2Kerc64CiGIm8so28g
TLSH
T1BD535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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