juko | c48ee573f909720a1389e7d5eea5d24744f8a200484ad07dce26d14e43c5454e

General

Target
2026-10-01_3a82d8101f34b64295428c1d61a49227_elex_wannacry.exe
Size 45KB
Sample261002-t1nedayarg
SHA256 c48ee573f909720a1389e7d5eea5d24744f8a200484ad07dce26d14e43c5454e
MD5 3a82d8101f34b64295428c1d61a49227
SHA1 b58901057d43863f0c7f0c3e531755b727a18115
SHA512 06fd2bf66513a09dde9586afed76fa03570b65bda44fcc946106013f9b18ae14664d8a1db19a52b8db798ae13219bda37a94d9a4096f6b08c10ab62ccc79d3ab
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBtzY5o+l:aLsF2Kerc64sTiX2IV0DVyIGFfo+l
TLSH
T17B233A2A3B54B062C6E612B4EA5A1F38C43A5D70042BF411F7443A4D28B6D66EF767CF
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/3576-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000900000001138c-5.dat	family_juko
behavioral2/memory/3576-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2992-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c53e-13.dat	family_juko
behavioral2/memory/4760-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2992	WINWORD.exe
4760	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-1-5-21-1404337215-1550464601-2805570857-1000\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
4120	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-01_3a82d8101f34b64295428c1d61a49227_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

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
4120	cmd.exe
4840	PING.EXE
4112	PING.EXE
4940	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4940	PING.EXE
4840	PING.EXE
4112	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3576 wrote to memory of 2992	3576	2026-10-01_3a82d8101f34b64295428c1d61a49227_elex_wannacry.exe	89
PID 2992 wrote to memory of 4120	2992	WINWORD.exe	90
PID 4120 wrote to memory of 4840	4120	cmd.exe	92
PID 4120 wrote to memory of 4112	4120	cmd.exe	93
PID 4120 wrote to memory of 4940	4120	cmd.exe	94
PID 4120 wrote to memory of 4760	4120	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-01_3a82d8101f34b64295428c1d61a49227_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-01_3a82d8101f34b64295428c1d61a49227_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3576
- 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:2992
- - 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\00000C52" 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:4120
  - - 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:4840
  - - 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:4112
  - - 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:4940
  - - 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:4760

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

00000C52

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000C52
Size 45KB
SHA256 52aa67804ff2e8d3ad3385725755e3a30e959936c61ae4a45da6b45c7a69f0ba
MD5 a94c7fac5633138ec27685616513d177
SHA1 8136c19bd9cc71cbb89c49249780b775e4364568
SHA512 a4290d89e46456ad2b8cdb3bb7fe0fd8e660b2aac9b3f1008ed9013d447dba9cde228ff02f6349eb382cf8578a7253269c2346986eb998d36ff20770d7ef8a2a
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBtzY5o+n:aLsF2Kerc64sTiX2IV0DVyIGFfo+n
TLSH
T19F233A2A3B54B062C6E612B4EA5A1F38C43A5D70042BF411F7443A4D28B6D66EF767CF
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 45KB
SHA256 c48ee573f909720a1389e7d5eea5d24744f8a200484ad07dce26d14e43c5454e
MD5 3a82d8101f34b64295428c1d61a49227
SHA1 b58901057d43863f0c7f0c3e531755b727a18115
SHA512 06fd2bf66513a09dde9586afed76fa03570b65bda44fcc946106013f9b18ae14664d8a1db19a52b8db798ae13219bda37a94d9a4096f6b08c10ab62ccc79d3ab
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBtzY5o+l:aLsF2Kerc64sTiX2IV0DVyIGFfo+l
TLSH
T17B233A2A3B54B062C6E612B4EA5A1F38C43A5D70042BF411F7443A4D28B6D66EF767CF
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2992-12-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/3576-0-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/3576-10-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/4760-16-0x0000000000400000-0x000000000041D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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