juko | c6d31862a56abb50805f4916063a5d9031f80318c23bb87cfe9121226497e916

General

Target
2026-08-11_2093133fd720a63572da77765b47f773_elex_wannacry.exe
Size 87KB
Sample260811-z2mgcssarh
SHA256 c6d31862a56abb50805f4916063a5d9031f80318c23bb87cfe9121226497e916
MD5 2093133fd720a63572da77765b47f773
SHA1 b4982a4d0756d4ab5dcd0916d71020128285b08c
SHA512 2308a8126575cd3d9b728ef9f686ee6701951d3ac830183687de54c921b209bf0bb2285c1b4123a58e0dc3da631429bb397d5e210ae1a26f4d6a265c628ae9fd
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpb:2Ly2Kerc64CiGIm1K851YO6EQkwpb
TLSH
T1DF93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/4288-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x0008000000011394-5.dat	family_juko
behavioral2/memory/4288-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4928-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c550-13.dat	family_juko
behavioral2/memory/5016-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5016-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4928	WINWORD.exe
5016	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-1-5-21-3989226554-2204910950-1522900112-1000\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
4444	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-11_2093133fd720a63572da77765b47f773_elex_wannacry.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
4444	cmd.exe
1160	PING.EXE
3748	PING.EXE
4100	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1160	PING.EXE
3748	PING.EXE
4100	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4288 wrote to memory of 4928	4288	2026-08-11_2093133fd720a63572da77765b47f773_elex_wannacry.exe	89
PID 4928 wrote to memory of 4444	4928	WINWORD.exe	90
PID 4444 wrote to memory of 1160	4444	cmd.exe	92
PID 4444 wrote to memory of 3748	4444	cmd.exe	93
PID 4444 wrote to memory of 4100	4444	cmd.exe	94
PID 4444 wrote to memory of 5016	4444	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-11_2093133fd720a63572da77765b47f773_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-11_2093133fd720a63572da77765b47f773_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4288
- 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:4928
- - 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\00000FA0" 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:4444
  - - 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:1160
  - - 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:3748
  - - 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:4100
  - - 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:5016

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:4408

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00000FA0

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000FA0
Size 87KB
SHA256 a4f5bae9d4ff67c21293d25d79f312c148a5587a49b7b4c6806540428294d936
MD5 977dc2fad579d609347a1b83c86b54d2
SHA1 a584a640a65d7f4a11d4e632ea4c718d424995ff
SHA512 6f0b8b4281c1b08291ed00061af9a28d36216d00fbaf1cd1b922a8130a63bc25e22a41d1793fd12a9591fb91f5534c913024cb776c365f8ade2119356acd48cb
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpA:2Ly2Kerc64CiGIm1K851YO6EQkwpA
TLSH
T1AF93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 c6d31862a56abb50805f4916063a5d9031f80318c23bb87cfe9121226497e916
MD5 2093133fd720a63572da77765b47f773
SHA1 b4982a4d0756d4ab5dcd0916d71020128285b08c
SHA512 2308a8126575cd3d9b728ef9f686ee6701951d3ac830183687de54c921b209bf0bb2285c1b4123a58e0dc3da631429bb397d5e210ae1a26f4d6a265c628ae9fd
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpb:2Ly2Kerc64CiGIm1K851YO6EQkwpb
TLSH
T1DF93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4288-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4288-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4928-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5016-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5016-16-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads