juko | 8f921a0b9929af7742faced191b94f3313c8cc24c054575e3f17f6a415c5acc0

General

Target
2026-10-30_9170ee2082aa04cd208a6f4457a974bb_elex_wannacry.exe
Size 90KB
Sample261030-13fwmsff58
SHA256 8f921a0b9929af7742faced191b94f3313c8cc24c054575e3f17f6a415c5acc0
MD5 9170ee2082aa04cd208a6f4457a974bb
SHA1 86f7df95dc2531e6ba708e4a3596e4290612a906
SHA512 720abd8844d624471dbc3a377c46b97bed15afa874607655c11f0ccfd2bca6f37971e658e6c502b7acc370a4f725348d69f8fff56f2c738b66cdf8ae4887a2d7
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLowsDtU1E3ZYa6jK0GIh9E/H:vLy2Kerc64CiGImVuX/N81rRLoPtU+39
TLSH
T16F933A1BF18A279CF6178274DAAA5A70A0BD7CB44533FC3E6B14F2302F71C219B25959
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 6 IoCs

resource	yara_rule
behavioral2/memory/3104-0-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000800000001b867-4.dat	family_juko
behavioral2/memory/3104-10-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/memory/4100-12-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c555-13.dat	family_juko
behavioral2/memory/5552-16-0x0000000000400000-0x000000000041C000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4100	WINWORD.exe
5552	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-1-5-21-650287814-2715975232-1279715623-1000\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
4596	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	2026-10-30_9170ee2082aa04cd208a6f4457a974bb_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
4768	PING.EXE
1704	PING.EXE
1808	PING.EXE
4596	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4768	PING.EXE
1704	PING.EXE
1808	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3104 wrote to memory of 4100	3104	2026-10-30_9170ee2082aa04cd208a6f4457a974bb_elex_wannacry.exe	89
PID 4100 wrote to memory of 4596	4100	WINWORD.exe	90
PID 4596 wrote to memory of 4768	4596	cmd.exe	92
PID 4596 wrote to memory of 1704	4596	cmd.exe	93
PID 4596 wrote to memory of 1808	4596	cmd.exe	94
PID 4596 wrote to memory of 5552	4596	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-30_9170ee2082aa04cd208a6f4457a974bb_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-30_9170ee2082aa04cd208a6f4457a974bb_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3104
- 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:4100
- - 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\00007DF7" 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:4596
  - - 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:4768
  - - 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:1704
  - - 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:1808
  - - 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:5552

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

00007DF7

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007DF7
Size 90KB
SHA256 15dcc6b9a6bb063735bbf321651696cbebcbcbfb2dfc93c1e5af2ef44634518d
MD5 e982af8fb4358c5a290df762d5780cd7
SHA1 97c25fd0dfaf76986822a6417eb063e5d1f906dd
SHA512 96070abd25cfc55eb773252a81307d1e46c61ec900887ec76bee352e8a226b4ccca6bb8d92206f73b8923798f43dbe20460524abb4507c0ac65942fabbd14b92
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLowsDtU1E3ZYa6jK0GIh9E/7:vLy2Kerc64CiGImVuX/N81rRLoPtU+3F
TLSH
T1AD933A1BF18A279CF6178274DAAA5A70A0BD7CB44533BC3E6B14F2302F71C219B25959
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 90KB
SHA256 8f921a0b9929af7742faced191b94f3313c8cc24c054575e3f17f6a415c5acc0
MD5 9170ee2082aa04cd208a6f4457a974bb
SHA1 86f7df95dc2531e6ba708e4a3596e4290612a906
SHA512 720abd8844d624471dbc3a377c46b97bed15afa874607655c11f0ccfd2bca6f37971e658e6c502b7acc370a4f725348d69f8fff56f2c738b66cdf8ae4887a2d7
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DhuX/N+ASX1rRLowsDtU1E3ZYa6jK0GIh9E/H:vLy2Kerc64CiGImVuX/N81rRLoPtU+39
TLSH
T16F933A1BF18A279CF6178274DAAA5A70A0BD7CB44533FC3E6B14F2302F71C219B25959
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3104-0-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/3104-10-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/4100-12-0x0000000000400000-0x000000000041C000-memory.dmp

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memory/5552-16-0x0000000000400000-0x000000000041C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads