juko | 015599b09abaec9ae8fa403e401568c9c7ee3beac982eb630e387ee8507ac624

General

Target
2026-07-28_72052397e3ca2cb801b36e02c570f978_elex_wannacry.exe
Size 61KB
Sample260728-2p86psbk91
SHA256 015599b09abaec9ae8fa403e401568c9c7ee3beac982eb630e387ee8507ac624
MD5 72052397e3ca2cb801b36e02c570f978
SHA1 809069e876c77bc53854fe11d3ed174877c3ec43
SHA512 5c449a635ac011f872c6e871874d06874534ef09224aa2818c083f09c3955c1930574ed72b9851412066cc7985afac1e4780bebbe0002c9fe81dc012d1a55b0e
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQy:yLy2Kerc64CiGImVZuyp8TF
TLSH
T15B532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
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/5776-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x001000000001b87e-5.dat	family_juko
behavioral2/memory/5776-9-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4888-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c530-13.dat	family_juko
behavioral2/memory/4340-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4340-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4888	WINWORD.exe
4340	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-1-5-21-1875162379-3804078649-638427191-1000\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
5228	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	2026-07-28_72052397e3ca2cb801b36e02c570f978_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
2452	PING.EXE
5228	cmd.exe
4640	PING.EXE
2816	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4640	PING.EXE
2816	PING.EXE
2452	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5776 wrote to memory of 4888	5776	2026-07-28_72052397e3ca2cb801b36e02c570f978_elex_wannacry.exe	90
PID 4888 wrote to memory of 5228	4888	WINWORD.exe	91
PID 5228 wrote to memory of 4640	5228	cmd.exe	93
PID 5228 wrote to memory of 2816	5228	cmd.exe	94
PID 5228 wrote to memory of 2452	5228	cmd.exe	95
PID 5228 wrote to memory of 4340	5228	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-07-28_72052397e3ca2cb801b36e02c570f978_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-28_72052397e3ca2cb801b36e02c570f978_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5776
- 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:4888
- - 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\000023D7" 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:5228
  - - 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:4640
  - - 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:2816
  - - 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:2452
  - - 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:4340

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

000023D7

Path C:\Users\Admin\AppData\Roaming\Mozilla\000023D7
Size 61KB
SHA256 997e2b8141bd525ec19e01c1194d45e820a86cc287a09bad1e78c613aca883d5
MD5 bc33e1bbd79d9ecc74bb7f7716b2e30a
SHA1 eef28f2a636436a2052a4ce00dbe1c619eb3c7ba
SHA512 9478fe0ef81144d0a85f2092b7a29774acdce27d8ca0cb5498a3c9fac8cb013243e67cf1f768a3b3caac234a99b95a4d0dd0306651a032289d0b2b9ab0172de3
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQC:yLy2Kerc64CiGImVZuyp8T9
TLSH
T1C6532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 61KB
SHA256 015599b09abaec9ae8fa403e401568c9c7ee3beac982eb630e387ee8507ac624
MD5 72052397e3ca2cb801b36e02c570f978
SHA1 809069e876c77bc53854fe11d3ed174877c3ec43
SHA512 5c449a635ac011f872c6e871874d06874534ef09224aa2818c083f09c3955c1930574ed72b9851412066cc7985afac1e4780bebbe0002c9fe81dc012d1a55b0e
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQy:yLy2Kerc64CiGImVZuyp8TF
TLSH
T15B532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4340-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4340-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4888-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5776-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5776-9-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads