juko | 49920c0e8000e133d4a824cfe70529fec11d98621f4993fdd387102cb5899ec6

General

Target
2026-08-03_283acc33eb69df57ec36623e1f4c01cc_elex_wannacry.exe
Size 142KB
Sample260803-pc184san2w
SHA256 49920c0e8000e133d4a824cfe70529fec11d98621f4993fdd387102cb5899ec6
MD5 283acc33eb69df57ec36623e1f4c01cc
SHA1 21add6329c9c1f71cc74e5dd15b35a5277fd0ffe
SHA512 2451f07a38c8a15c522153e360a17d2e95f3e3ed8702da22247ea81f58107d5f2f800eedfe67bd239476d4a2e7e0c62b0e973d10d2f27c116df48e81f1b2d97f
SSDEEP 3072:4Ly2Kerc64CiGImHi/28wzCBlycJWeedCgVnsUp4kojWh2fEQkwpU:4Ly2Kwc64YIK628wzQocJje7RsUmWx8U
TLSH
T13EE33A3A75A200E8C81BC478C5A65631F632FCB537B2672F9300BA791EB0D139F9D995
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/4564-0-0x0000000000400000-0x0000000000439000-memory.dmp	family_juko
behavioral2/files/0x00180000000115e1-5.dat	family_juko
behavioral2/memory/4564-10-0x0000000000400000-0x0000000000439000-memory.dmp	family_juko
behavioral2/memory/1264-12-0x0000000000400000-0x0000000000439000-memory.dmp	family_juko
behavioral2/files/0x000600000001b853-13.dat	family_juko
behavioral2/memory/1064-15-0x0000000000400000-0x0000000000439000-memory.dmp	family_juko
behavioral2/memory/1064-16-0x0000000000400000-0x0000000000439000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1264	WINWORD.exe
1064	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-1-5-21-2115213192-531537726-3295841909-1000\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
360	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	2026-08-03_283acc33eb69df57ec36623e1f4c01cc_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
360	cmd.exe
3624	PING.EXE
5108	PING.EXE
3876	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3624	PING.EXE
5108	PING.EXE
3876	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4564 wrote to memory of 1264	4564	2026-08-03_283acc33eb69df57ec36623e1f4c01cc_elex_wannacry.exe	89
PID 1264 wrote to memory of 360	1264	WINWORD.exe	90
PID 360 wrote to memory of 3624	360	cmd.exe	92
PID 360 wrote to memory of 5108	360	cmd.exe	93
PID 360 wrote to memory of 3876	360	cmd.exe	94
PID 360 wrote to memory of 1064	360	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-03_283acc33eb69df57ec36623e1f4c01cc_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-03_283acc33eb69df57ec36623e1f4c01cc_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4564
- 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:1264
- - 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\000025B7" 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:360
  - - 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:3624
  - - 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:5108
  - - 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:3876
  - - 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:1064

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

000025B7

Path C:\Users\Admin\AppData\Roaming\Mozilla\000025B7
Size 142KB
SHA256 a91f682e88edcefe012e4c651dfc47b59e6a723f8a2b9e89a92664dc8e53dddc
MD5 2899c976db8515cbe0a6ad68370e73f5
SHA1 e55820f7a0654eba21f89b03c031ff18c6486015
SHA512 025eefa4e7902e2e623dc5cb60d32dffad83667f639bd1eef3558f80d732ca38c83cc73cb4d7131b4c4711b11afa36d3347a9553243286e71deda0d9c9cfa2b2
SSDEEP 3072:4Ly2Kerc64CiGImHi/28wzCBlycJWeedCgVnsUp4kojWh2fEQkwpt:4Ly2Kwc64YIK628wzQocJje7RsUmWx8t
TLSH
T1DDE33A3A75A200E8C81BC478C5A65631F632FCB537B2672F9300BA791EB0D139F9D995
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 142KB
SHA256 49920c0e8000e133d4a824cfe70529fec11d98621f4993fdd387102cb5899ec6
MD5 283acc33eb69df57ec36623e1f4c01cc
SHA1 21add6329c9c1f71cc74e5dd15b35a5277fd0ffe
SHA512 2451f07a38c8a15c522153e360a17d2e95f3e3ed8702da22247ea81f58107d5f2f800eedfe67bd239476d4a2e7e0c62b0e973d10d2f27c116df48e81f1b2d97f
SSDEEP 3072:4Ly2Kerc64CiGImHi/28wzCBlycJWeedCgVnsUp4kojWh2fEQkwpU:4Ly2Kwc64YIK628wzQocJje7RsUmWx8U
TLSH
T13EE33A3A75A200E8C81BC478C5A65631F632FCB537B2672F9300BA791EB0D139F9D995
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1064-15-0x0000000000400000-0x0000000000439000-memory.dmp

Download

memory/1064-16-0x0000000000400000-0x0000000000439000-memory.dmp

Download

memory/1264-12-0x0000000000400000-0x0000000000439000-memory.dmp

Download

memory/4564-0-0x0000000000400000-0x0000000000439000-memory.dmp

Download

memory/4564-10-0x0000000000400000-0x0000000000439000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads