juko | 7d94b9f5be5e40f01dbaded31a1ccca542bff2e796296cbb0270d1adf656b303

General

Target
2026-04-26_f9ecf59db3a635a361bdf6a058962cbe_elex_wannacry.exe
Size 53KB
Sample260426-varjsaby8w
SHA256 7d94b9f5be5e40f01dbaded31a1ccca542bff2e796296cbb0270d1adf656b303
MD5 f9ecf59db3a635a361bdf6a058962cbe
SHA1 64ea7daa1e754f5daeab6edd16b50dcc7efddecf
SHA512 3e28ff5671785aadc48efa42a8f23ef0ba6744c9ca042de8c7562c8f371bd518b972adf7b116389e9f266365d6f3904fd5ece495bcf77eb3dc44232197cd6935
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq22:3Ly2Kerc64CiGIm1tcBMUOOF2
TLSH
T14A335C176A559056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 2 IoCs

resource	yara_rule
behavioral2/files/0x00140000000256dc-4.dat	family_juko
behavioral2/files/0x002000000002b162-14.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3280	WINWORD.exe
1080	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-1-5-21-3847269522-1618051987-1942096715-1000\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

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	2026-04-26_f9ecf59db3a635a361bdf6a058962cbe_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
3572	cmd.exe
1084	PING.EXE
3252	PING.EXE
1060	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1084	PING.EXE
3252	PING.EXE
1060	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1184 wrote to memory of 3280	1184	2026-04-26_f9ecf59db3a635a361bdf6a058962cbe_elex_wannacry.exe	80
PID 3280 wrote to memory of 3572	3280	WINWORD.exe	81
PID 3572 wrote to memory of 1084	3572	cmd.exe	83
PID 3572 wrote to memory of 3252	3572	cmd.exe	84
PID 3572 wrote to memory of 1060	3572	cmd.exe	85
PID 3572 wrote to memory of 1080	3572	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-04-26_f9ecf59db3a635a361bdf6a058962cbe_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-26_f9ecf59db3a635a361bdf6a058962cbe_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1184
- 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:3280
- - 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\00001189" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3572
  - - 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:1084
  - - 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:3252
  - - 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:1060
  - - 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
      System Location Discovery: System Language Discovery
      PID:1080

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00001189

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001189
Size 53KB
SHA256 e5ed2c87782eacaedc6fde0e59084eac1d7b900f27cbe9bcc7de68ec70c51370
MD5 b59db69d4da6314b7ec61028e80f916a
SHA1 7a303a41653297c5bdd840f2cb3b063f19911638
SHA512 6f603433aee245720e42054589c5c805a97c3cf2330a40269c8e0aab5b54c1486466a03273fd2046ee7019d5f343d54a5931814370f9516caa9fcda3fade3dc8
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq22:3Ly2Kerc64CiGIm1tcBMUOOF2
TLSH
T1F9335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 7d94b9f5be5e40f01dbaded31a1ccca542bff2e796296cbb0270d1adf656b303
MD5 f9ecf59db3a635a361bdf6a058962cbe
SHA1 64ea7daa1e754f5daeab6edd16b50dcc7efddecf
SHA512 3e28ff5671785aadc48efa42a8f23ef0ba6744c9ca042de8c7562c8f371bd518b972adf7b116389e9f266365d6f3904fd5ece495bcf77eb3dc44232197cd6935
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq22:3Ly2Kerc64CiGIm1tcBMUOOF2
TLSH
T14A335C176A559056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1184-10-0x0000000002650000-0x000000000279D000-memory.dmp

Download

memory/3280-13-0x0000000002660000-0x00000000027AD000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads