juko | 74d934b6be642fa524baf075fd53d9c7020d8103c0bd53be1c19aabba85279d2

General

Target
2026-08-15_eef6f01bcbd19683f05f134738dad3a8_elex_wannacry.exe
Size 87KB
Sample260815-bdrjeada84
SHA256 74d934b6be642fa524baf075fd53d9c7020d8103c0bd53be1c19aabba85279d2
MD5 eef6f01bcbd19683f05f134738dad3a8
SHA1 e15fc135bd4852ea2eaa5072a392c8960f754e5b
SHA512 e83e95bc92ee3147baa629edb1b061f3744752bb2098ce48727b7a70f1f277166e9252b075913418db002ca9fd2109bfe67052acf5f167eeaff73b74f94cefc9
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpp:2Ly2Kerc64CiGIm1K851YO6EQkwpp
TLSH
T18293A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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
behavioral1/memory/3976-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000b00000002433e-5.dat	family_juko
behavioral1/memory/3976-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/2664-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000900000002447b-15.dat	family_juko
behavioral1/memory/2420-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/2420-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	2026-08-15_eef6f01bcbd19683f05f134738dad3a8_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2664	WINWORD.exe
2420	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-1-5-21-204488895-2999877624-296153668-1000\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
5068	cmd.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	2026-08-15_eef6f01bcbd19683f05f134738dad3a8_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
5068	cmd.exe
528	PING.EXE
4736	PING.EXE
3960	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
528	PING.EXE
4736	PING.EXE
3960	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3976 wrote to memory of 2664	3976	2026-08-15_eef6f01bcbd19683f05f134738dad3a8_elex_wannacry.exe	86
PID 2664 wrote to memory of 5068	2664	WINWORD.exe	87
PID 5068 wrote to memory of 528	5068	cmd.exe	89
PID 5068 wrote to memory of 4736	5068	cmd.exe	91
PID 5068 wrote to memory of 3960	5068	cmd.exe	92
PID 5068 wrote to memory of 2420	5068	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-15_eef6f01bcbd19683f05f134738dad3a8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-15_eef6f01bcbd19683f05f134738dad3a8_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3976
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2664
- - 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\00005AA6" 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:5068
  - - 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:528
  - - 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:4736
  - - 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:3960
  - - 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:2420

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00005AA6

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005AA6
Size 87KB
SHA256 a7b810735355ad090b494828fcdcf2aff8c911d162ac67d684619642eb668b88
MD5 3ec4f52235c6f07c0325631cbabf20fa
SHA1 8a259a978c884c75c586aa0c1a78b9cfa8e0ae93
SHA512 ab6c7edb135304ee93ced187e151cca948ee11932aa5581d18975f208305ef5dc50739397504c237ad762d958c7d4547b562c259705fb43dcf0af7d462f24801
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpL:2Ly2Kerc64CiGIm1K851YO6EQkwpL
TLSH
T16B93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 74d934b6be642fa524baf075fd53d9c7020d8103c0bd53be1c19aabba85279d2
MD5 eef6f01bcbd19683f05f134738dad3a8
SHA1 e15fc135bd4852ea2eaa5072a392c8960f754e5b
SHA512 e83e95bc92ee3147baa629edb1b061f3744752bb2098ce48727b7a70f1f277166e9252b075913418db002ca9fd2109bfe67052acf5f167eeaff73b74f94cefc9
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpp:2Ly2Kerc64CiGIm1K851YO6EQkwpp
TLSH
T18293A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2420-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2420-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2664-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3976-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3976-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads