juko | 91666f09490b9620d93922887aa10f2520748dc803f4bbb72de9cb24a325330d

General

Target
2026-11-01_cca7fb74ace9dd3ff33fd186c1a70540_elex_wannacry.exe
Size 86KB
Sample261102-keze3sty5m
SHA256 91666f09490b9620d93922887aa10f2520748dc803f4bbb72de9cb24a325330d
MD5 cca7fb74ace9dd3ff33fd186c1a70540
SHA1 1ac5f46346c367818688df9bd09cd7533b4278aa
SHA512 b0b874be02957faeeba93293781961e44a168bf00f7db7c4fb609d9315ea0fceea2102b95adafecf21473e3ee422c277a37cf9b41298be0e2d8016ee26764d57
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwp+:vLy2Kerc64CiGImMPu/ouEQkwp+
TLSH
T13283C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
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 8 IoCs

resource	yara_rule
behavioral1/memory/3852-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000b000000024316-4.dat	family_juko
behavioral1/memory/2140-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/3852-13-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/2140-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x00090000000244a1-16.dat	family_juko
behavioral1/memory/1152-19-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/1152-20-0x0000000000400000-0x0000000000425000-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-1-5-21-895009113-1202185046-1686627690-1000\Control Panel\International\Geo\Nation	2026-11-01_cca7fb74ace9dd3ff33fd186c1a70540_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-895009113-1202185046-1686627690-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2140	WINWORD.exe
1152	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-1-5-21-895009113-1202185046-1686627690-1000\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
1200	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-11-01_cca7fb74ace9dd3ff33fd186c1a70540_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

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
1200	cmd.exe
3208	PING.EXE
4264	PING.EXE
4716	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4716	PING.EXE
3208	PING.EXE
4264	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3852 wrote to memory of 2140	3852	2026-11-01_cca7fb74ace9dd3ff33fd186c1a70540_elex_wannacry.exe	85
PID 2140 wrote to memory of 1200	2140	WINWORD.exe	86
PID 1200 wrote to memory of 3208	1200	cmd.exe	88
PID 1200 wrote to memory of 4264	1200	cmd.exe	91
PID 1200 wrote to memory of 4716	1200	cmd.exe	94
PID 1200 wrote to memory of 1152	1200	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-11-01_cca7fb74ace9dd3ff33fd186c1a70540_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-01_cca7fb74ace9dd3ff33fd186c1a70540_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3852
- 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:2140
- - 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\00002680" 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:1200
  - - 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:3208
  - - 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:4264
  - - 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:4716
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:1152

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00002680

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002680
Size 86KB
SHA256 33d73c202c2d34db7829cb66c42082029364cd0222d1f348142592623d7193c4
MD5 bf07ed6cb5915e7f1e19242db74b51bf
SHA1 cfa143f24208cec4b7872e871c53595359e1b7fd
SHA512 4c5b9d1f89c84e1445760081a3ceb0ac3f9fa69a18974d7ca080e383a7e94c0506e057adf09b57f65be838f95a6296b8569b00f3010c4e05a1dd3054fd5ac51b
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpN:vLy2Kerc64CiGImMPu/ouEQkwpN
TLSH
T15383C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 86KB
SHA256 91666f09490b9620d93922887aa10f2520748dc803f4bbb72de9cb24a325330d
MD5 cca7fb74ace9dd3ff33fd186c1a70540
SHA1 1ac5f46346c367818688df9bd09cd7533b4278aa
SHA512 b0b874be02957faeeba93293781961e44a168bf00f7db7c4fb609d9315ea0fceea2102b95adafecf21473e3ee422c277a37cf9b41298be0e2d8016ee26764d57
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwp+:vLy2Kerc64CiGImMPu/ouEQkwp+
TLSH
T13283C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1152-19-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/1152-20-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2140-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2140-15-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/3852-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3852-13-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads