juko | e799da6aba61b97a7c4e59b12abe6f97e7c6e90657402181e547808d01591892

General

Target
2026-08-17_2182ce3ed60b6977f3884fff3f7ab827_elex_wannacry.exe
Size 95KB
Sample260818-a2falsshqb
SHA256 e799da6aba61b97a7c4e59b12abe6f97e7c6e90657402181e547808d01591892
MD5 2182ce3ed60b6977f3884fff3f7ab827
SHA1 835499129ec8ec0f13281fc073b12f983feee0b6
SHA512 d938fd7c1882932b88b79808e798bf395deb1eaf6a91a839e0dca5f1884aa6e86e954acef8f6a473d3b099a9cd6052a194d96233648c29118444cc2569cf554e
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFN9:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAB
TLSH
T1FD93CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
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/4708-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x000a0000000242ec-5.dat	family_juko
behavioral1/memory/4708-11-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/2328-14-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x000400000001e695-15.dat	family_juko
behavioral1/memory/1132-17-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/1132-18-0x0000000000400000-0x000000000042B000-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-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	2026-08-17_2182ce3ed60b6977f3884fff3f7ab827_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2328	WINWORD.exe
1132	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-1-5-21-889581200-2041691093-2048517887-1000\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
4276	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	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	2026-08-17_2182ce3ed60b6977f3884fff3f7ab827_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

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
4704	PING.EXE
4628	PING.EXE
4276	cmd.exe
3944	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4628	PING.EXE
3944	PING.EXE
4704	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4708 wrote to memory of 2328	4708	2026-08-17_2182ce3ed60b6977f3884fff3f7ab827_elex_wannacry.exe	86
PID 2328 wrote to memory of 4276	2328	WINWORD.exe	87
PID 4276 wrote to memory of 3944	4276	cmd.exe	89
PID 4276 wrote to memory of 4704	4276	cmd.exe	90
PID 4276 wrote to memory of 4628	4276	cmd.exe	92
PID 4276 wrote to memory of 1132	4276	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-08-17_2182ce3ed60b6977f3884fff3f7ab827_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-17_2182ce3ed60b6977f3884fff3f7ab827_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4708
- 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:2328
- - 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\0000023C" 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:4276
  - - 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:3944
  - - 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:4704
  - - 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:4628
  - - 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:1132

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

0000023C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000023C
Size 95KB
SHA256 91980da05fbb2afabb17b2bbe049306e388b784b651fae5a6a7051f829e02d17
MD5 97fb3cb00a0cf62fa89cf37dda1d8687
SHA1 ff53d029ecf0381b5b05caf4610493b433666374
SHA512 b7e8597e384c5aef583caec7c3fa93aad5915feaf026ea333ea720358c56f9c995dcac63941aefed0321fb69f78dbedee09485f19200cd2690ae4f03df5c7b26
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNl:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAR
TLSH
T10993CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 e799da6aba61b97a7c4e59b12abe6f97e7c6e90657402181e547808d01591892
MD5 2182ce3ed60b6977f3884fff3f7ab827
SHA1 835499129ec8ec0f13281fc073b12f983feee0b6
SHA512 d938fd7c1882932b88b79808e798bf395deb1eaf6a91a839e0dca5f1884aa6e86e954acef8f6a473d3b099a9cd6052a194d96233648c29118444cc2569cf554e
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFN9:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAB
TLSH
T1FD93CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1132-17-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1132-18-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2328-14-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4708-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4708-11-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads