juko | dd6906f6d253c88d786f77ed2570a4888aaf00d6eb2483cf308ff46e5909b575

General

Target
2026-10-28_77aada2b5e9deab8548440ec08c77df8_elex_wannacry.exe
Size 49KB
Sample261030-b5qq7ada32
SHA256 dd6906f6d253c88d786f77ed2570a4888aaf00d6eb2483cf308ff46e5909b575
MD5 77aada2b5e9deab8548440ec08c77df8
SHA1 7cc340b842f9d933f50e47a3d43bc66d57ee3dbd
SHA512 464a452c3932300856a58a6f3e33cd595d300393bfbb88cee96970372ddaac7225d381769c24feb969f90763e131e01cec1aaef75636c3966cf75474e698aee1
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2/:VLy2Kerc64CiGImVu8p4kojWh2/
TLSH
T169334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/2800-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000700000001b856-4.dat	family_juko
behavioral2/memory/2800-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3420-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c4ca-13.dat	family_juko
behavioral2/memory/5344-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5344-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3420	WINWORD.exe
5344	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-1-5-21-4154726816-2055034831-2297277433-1000\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
5576	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	2026-10-28_77aada2b5e9deab8548440ec08c77df8_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
5576	cmd.exe
5028	PING.EXE
4668	PING.EXE
3928	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5028	PING.EXE
4668	PING.EXE
3928	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2800 wrote to memory of 3420	2800	2026-10-28_77aada2b5e9deab8548440ec08c77df8_elex_wannacry.exe	89
PID 3420 wrote to memory of 5576	3420	WINWORD.exe	90
PID 5576 wrote to memory of 5028	5576	cmd.exe	92
PID 5576 wrote to memory of 4668	5576	cmd.exe	93
PID 5576 wrote to memory of 3928	5576	cmd.exe	94
PID 5576 wrote to memory of 5344	5576	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-28_77aada2b5e9deab8548440ec08c77df8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-28_77aada2b5e9deab8548440ec08c77df8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2800
- 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:3420
- - 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\0000338A" 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:5576
  - - 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:5028
  - - 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:4668
  - - 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:3928
  - - 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:5344

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

0000338A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000338A
Size 49KB
SHA256 753f0862859ae2914f5add208b89f4a21d98b3d4686f0f04b763392a9fc1d8bd
MD5 8553732e9f06a3f69a88aee0bc615f6b
SHA1 a59d68b80951685f10a008a187319e383848b2e9
SHA512 6d91c4320484b9a182bb3773fe655a7ffc57a0764a85d127a7bab7a76c491d926f822ee326c361b92415d7447fadca05eddbf574aa7f5b8dac9d6b6f03874ac2
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2v:VLy2Kerc64CiGImVu8p4kojWh2v
TLSH
T1B0334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 dd6906f6d253c88d786f77ed2570a4888aaf00d6eb2483cf308ff46e5909b575
MD5 77aada2b5e9deab8548440ec08c77df8
SHA1 7cc340b842f9d933f50e47a3d43bc66d57ee3dbd
SHA512 464a452c3932300856a58a6f3e33cd595d300393bfbb88cee96970372ddaac7225d381769c24feb969f90763e131e01cec1aaef75636c3966cf75474e698aee1
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2/:VLy2Kerc64CiGImVu8p4kojWh2/
TLSH
T169334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2800-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2800-10-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3420-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5344-16-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5344-17-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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