juko | d3b04d9d4904f3f45d3ac5adaf6782f87e81600d79a380455c2756684fd6b2df

General

Target
2026-10-22_b020d343cb534a10d7f3fafebb4a1936_elex_wannacry.exe
Size 87KB
Sample261024-anpbcsey2t
SHA256 d3b04d9d4904f3f45d3ac5adaf6782f87e81600d79a380455c2756684fd6b2df
MD5 b020d343cb534a10d7f3fafebb4a1936
SHA1 a750305d4df2e7169c2060e85054f52ff5e491af
SHA512 64a9a9867bae5d4865684000c521d7d892f33e59078ce94f9ac831f55bb27f52f97e0c90de32996cad493c98da12f2b98b2fe914ae8ad34c400970d795625257
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpC:2Ly2Kerc64CiGIm1K851YO6EQkwpC
TLSH
T14B93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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 7 IoCs

resource	yara_rule
behavioral2/memory/5432-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000800000001b86a-4.dat	family_juko
behavioral2/memory/5432-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4572-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001000000001c580-13.dat	family_juko
behavioral2/memory/256-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/256-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4572	WINWORD.exe
256	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-1-5-21-4057491610-3392471755-192832105-1000\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
4440	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	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	2026-10-22_b020d343cb534a10d7f3fafebb4a1936_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
404	PING.EXE
4440	cmd.exe
2508	PING.EXE
988	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
404	PING.EXE
2508	PING.EXE
988	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5432 wrote to memory of 4572	5432	2026-10-22_b020d343cb534a10d7f3fafebb4a1936_elex_wannacry.exe	90
PID 4572 wrote to memory of 4440	4572	WINWORD.exe	91
PID 4440 wrote to memory of 2508	4440	cmd.exe	93
PID 4440 wrote to memory of 988	4440	cmd.exe	94
PID 4440 wrote to memory of 404	4440	cmd.exe	95
PID 4440 wrote to memory of 256	4440	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-22_b020d343cb534a10d7f3fafebb4a1936_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_b020d343cb534a10d7f3fafebb4a1936_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5432
- 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:4572
- - 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\0000553A" 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:4440
  - - 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:2508
  - - 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:988
  - - 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:404
  - - 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:256

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

0000553A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000553A
Size 87KB
SHA256 821030fcd3f66b8a0fb0b5ccdb17385777cc738772e7b1285881ed0aa05379a7
MD5 b04e8effba6956825644034494eb991a
SHA1 3f9c98d7a9c2ae9bede20766ab9e9f5fab612d86
SHA512 2de7a9ba94fce2977e4d6d526824657aaa2d13aaa856038245067178a24148149290d1a38d82d8a257e767114fd7f66c655a640f87ad9a59c7479c8e746a6370
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpY:2Ly2Kerc64CiGIm1K851YO6EQkwpY
TLSH
T1FC93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 d3b04d9d4904f3f45d3ac5adaf6782f87e81600d79a380455c2756684fd6b2df
MD5 b020d343cb534a10d7f3fafebb4a1936
SHA1 a750305d4df2e7169c2060e85054f52ff5e491af
SHA512 64a9a9867bae5d4865684000c521d7d892f33e59078ce94f9ac831f55bb27f52f97e0c90de32996cad493c98da12f2b98b2fe914ae8ad34c400970d795625257
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpC:2Ly2Kerc64CiGIm1K851YO6EQkwpC
TLSH
T14B93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/256-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/256-17-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/4572-12-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/5432-0-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/5432-9-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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