juko | 2dc6990211944f30b3066f47ec91a82ba86355036dfc65a7ef349a6535986c7a

General

Target
2026-10-02_5320e7fa978a16feed1a7b34d2e91db6_elex_wannacry.exe
Size 57KB
Sample261003-ps65asdb84
SHA256 2dc6990211944f30b3066f47ec91a82ba86355036dfc65a7ef349a6535986c7a
MD5 5320e7fa978a16feed1a7b34d2e91db6
SHA1 0f3c2e511b128d4ca48390a20d56494427f1fe34
SHA512 eae08abb4d62b4c7e9099eac1d866cff8c3a2081ed87523ad9d009b3d828b4d06e9cb76212c1786748154b2a06951e587b139996b57e10832a1a86e2150c798d
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqa3:wLy2Kerc64CiGImEsoDfa3
TLSH
T144433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
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/2040-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x00170000000115b2-4.dat	family_juko
behavioral2/memory/2040-9-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/2180-12-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x001000000001b30b-13.dat	family_juko
behavioral2/memory/2376-16-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/2376-17-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2180	WINWORD.exe
2376	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-1-5-21-2714045687-1127350534-2056456672-1000\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
4520	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-02_5320e7fa978a16feed1a7b34d2e91db6_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

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
4432	PING.EXE
4520	cmd.exe
4536	PING.EXE
2332	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4432	PING.EXE
4536	PING.EXE
2332	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2040 wrote to memory of 2180	2040	2026-10-02_5320e7fa978a16feed1a7b34d2e91db6_elex_wannacry.exe	90
PID 2180 wrote to memory of 4520	2180	WINWORD.exe	91
PID 4520 wrote to memory of 4536	4520	cmd.exe	93
PID 4520 wrote to memory of 2332	4520	cmd.exe	94
PID 4520 wrote to memory of 4432	4520	cmd.exe	95
PID 4520 wrote to memory of 2376	4520	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-02_5320e7fa978a16feed1a7b34d2e91db6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-02_5320e7fa978a16feed1a7b34d2e91db6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2040
- 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:2180
- - 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\000076C9" 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:4520
  - - 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:4536
  - - 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:2332
  - - 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:4432
  - - 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:2376

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

000076C9

Path C:\Users\Admin\AppData\Roaming\Mozilla\000076C9
Size 57KB
SHA256 1d85f426c9ac9590314dbc83b6e5a586ad77b4348cde396551846105ce4f7a45
MD5 d4fffef4191a89a2abac4a36c035b444
SHA1 ae120964733af44c426eb50c5f610a8a11320ee9
SHA512 451444b2d09da2939da00af6bfa67b1416bbaeb546b5209d4dc4c17fb20d894500bdcfed53364ee20dddcb379ac839229f6f9d09b86ffdbe6eba7d4fbcb0cc01
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqas:wLy2Kerc64CiGImEsoDfas
TLSH
T141433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 2dc6990211944f30b3066f47ec91a82ba86355036dfc65a7ef349a6535986c7a
MD5 5320e7fa978a16feed1a7b34d2e91db6
SHA1 0f3c2e511b128d4ca48390a20d56494427f1fe34
SHA512 eae08abb4d62b4c7e9099eac1d866cff8c3a2081ed87523ad9d009b3d828b4d06e9cb76212c1786748154b2a06951e587b139996b57e10832a1a86e2150c798d
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqa3:wLy2Kerc64CiGImEsoDfa3
TLSH
T144433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2040-0-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/2040-9-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/2180-12-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/2376-16-0x0000000000400000-0x000000000041F000-memory.dmp

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memory/2376-17-0x0000000000400000-0x000000000041F000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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