juko | 590fcf9d825b8b33283be009fe9c0fbd8f2b83dd6d551d4e495cbf753223ebf9

General

Target
2026-08-13_6e718d087e0885a65653fd842c27e317_elex_wannacry.exe
Size 87KB
Sample260813-sne2ssbf99
SHA256 590fcf9d825b8b33283be009fe9c0fbd8f2b83dd6d551d4e495cbf753223ebf9
MD5 6e718d087e0885a65653fd842c27e317
SHA1 60102f4032a84af98475baaf45bea85eda540eb7
SHA512 6aed672b65deb5f2d1b025459c1f44329544a8037ea70a056214538253de308462c8b925b168aa311357d5b628c33a225ffe3df45be07114e0b0d01f6b225d07
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpS:2Ly2Kerc64CiGIm1K851YO6EQkwpS
TLSH
T1D393A1763A259190C48BD138E8155AA0B932DCF52FF75303E6417AAC59B1E13CFAE8C6
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/4368-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5aa-5.dat	family_juko
behavioral2/memory/4368-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/1216-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5ab-13.dat	family_juko
behavioral2/memory/5920-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5920-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1216	WINWORD.exe
5920	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-1-5-21-4046655672-1449839301-2197395821-1000\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
1904	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-13_6e718d087e0885a65653fd842c27e317_elex_wannacry.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
4348	PING.EXE
252	PING.EXE
1904	cmd.exe
2336	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2336	PING.EXE
4348	PING.EXE
252	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4368 wrote to memory of 1216	4368	2026-08-13_6e718d087e0885a65653fd842c27e317_elex_wannacry.exe	89
PID 1216 wrote to memory of 1904	1216	WINWORD.exe	90
PID 1904 wrote to memory of 2336	1904	cmd.exe	92
PID 1904 wrote to memory of 4348	1904	cmd.exe	93
PID 1904 wrote to memory of 252	1904	cmd.exe	94
PID 1904 wrote to memory of 5920	1904	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-13_6e718d087e0885a65653fd842c27e317_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-13_6e718d087e0885a65653fd842c27e317_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4368
- 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:1216
- - 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\00003D13" 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:1904
  - - 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:2336
  - - 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:4348
  - - 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:252
  - - 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:5920

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

00003D13

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003D13
Size 87KB
SHA256 19bc5413deca41c551860903c3da503ac20804f4586d3bd7724a0f1bb11bc0a0
MD5 a0693fa25e644c2ec6b8a82cfc10889e
SHA1 3fa7109ab48e64b1f14ebe750cf12b08560687d5
SHA512 a83a2384b24b7f1cc0f3a32887006b4c7a599a71f3a63c32d6504c6c7a8359c68c550eda6234a37604e8b7a074a38cdf09f3473ed2cbdb7f636ee019e67a7e3c
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpL:2Ly2Kerc64CiGIm1K851YO6EQkwpL
TLSH
T1BD93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 590fcf9d825b8b33283be009fe9c0fbd8f2b83dd6d551d4e495cbf753223ebf9
MD5 6e718d087e0885a65653fd842c27e317
SHA1 60102f4032a84af98475baaf45bea85eda540eb7
SHA512 6aed672b65deb5f2d1b025459c1f44329544a8037ea70a056214538253de308462c8b925b168aa311357d5b628c33a225ffe3df45be07114e0b0d01f6b225d07
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpS:2Ly2Kerc64CiGIm1K851YO6EQkwpS
TLSH
T1D393A1763A259190C48BD138E8155AA0B932DCF52FF75303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1216-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4368-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4368-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5920-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5920-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads