juko | 7b91ccd4e9f0110fc1ec4436d48a1b2a8dc0d2efc6e658dcbeaf3afd0e42e048

General

Target
2026-05-11_04f05dd5a59e558477919a7ce9883263_elex_wannacry.exe
Size 57KB
Sample260511-kbmxwadt21
SHA256 7b91ccd4e9f0110fc1ec4436d48a1b2a8dc0d2efc6e658dcbeaf3afd0e42e048
MD5 04f05dd5a59e558477919a7ce9883263
SHA1 3fe690ac0badd09ff04ef5e7c859c9324fd7d61d
SHA512 c155af4f812eaaed6dad2fc14151c7106fe7c4a9edd20b55bbb8eae882a2907bbdf1450522547dc36e4092fecebc2c37dc2bb61683a4801d69b53b1e519ccf5f
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqao:wLy2Kerc64CiGImEsoDfao
TLSH
T1C8433913366414D1D8BB2138A4025E354BB8BDB21467F222B750BA1E1D779DACFAC3CE
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 7 IoCs

resource	yara_rule
behavioral2/memory/5060-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x0013000000026154-5.dat	family_juko
behavioral2/memory/5060-11-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/3548-14-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x001d00000002b3c0-15.dat	family_juko
behavioral2/memory/988-17-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/988-18-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3548	WINWORD.exe
988	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-1-5-21-600123060-2148212387-2211176695-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-11_04f05dd5a59e558477919a7ce9883263_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

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
4320	PING.EXE
4236	PING.EXE
3168	cmd.exe
4284	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4284	PING.EXE
4320	PING.EXE
4236	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5060 wrote to memory of 3548	5060	2026-05-11_04f05dd5a59e558477919a7ce9883263_elex_wannacry.exe	78
PID 3548 wrote to memory of 3168	3548	WINWORD.exe	79
PID 3168 wrote to memory of 4284	3168	cmd.exe	81
PID 3168 wrote to memory of 4320	3168	cmd.exe	82
PID 3168 wrote to memory of 4236	3168	cmd.exe	83
PID 3168 wrote to memory of 988	3168	cmd.exe	84

C:\Users\Admin\AppData\Local\Temp\2026-05-11_04f05dd5a59e558477919a7ce9883263_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-11_04f05dd5a59e558477919a7ce9883263_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5060
- 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:3548
- - 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\00006814" 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:3168
  - - 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:4284
  - - 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:4320
  - - 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:4236
  - - 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:988

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

00006814

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006814
Size 57KB
SHA256 3c84d282570f360580e7afe6341a3317758035511de280947b7ec353f545844c
MD5 f3e0c56d6196e2936b03b3d5bad09e13
SHA1 fac20367c6c611bc8f94bb6b1af95335af2bdd1c
SHA512 958eb28b946e12e37e4ac2cb02415b955ea5ced1cbf1dfe985bbb2ad436943380dc1f5213d1f18d8866d33a6a945fe55e2e51d575092ac59dd975b252c7c2f02
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9DmqaT:wLy2Kerc64CiGImEsoDfaT
TLSH
T114433913366414D1D8AB2138A4025E354BB8BDB21467F222B750BA1E1D779DACFA83CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 7b91ccd4e9f0110fc1ec4436d48a1b2a8dc0d2efc6e658dcbeaf3afd0e42e048
MD5 04f05dd5a59e558477919a7ce9883263
SHA1 3fe690ac0badd09ff04ef5e7c859c9324fd7d61d
SHA512 c155af4f812eaaed6dad2fc14151c7106fe7c4a9edd20b55bbb8eae882a2907bbdf1450522547dc36e4092fecebc2c37dc2bb61683a4801d69b53b1e519ccf5f
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqao:wLy2Kerc64CiGImEsoDfao
TLSH
T1C8433913366414D1D8BB2138A4025E354BB8BDB21467F222B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/988-17-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/988-18-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/3548-14-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5060-0-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5060-11-0x0000000000400000-0x000000000041F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads