juko | 1f2a4ffa8c281c32d89bd9869758c7692827cc36b53b7fc6594c21975983bde7

General

Target
2026-10-22_b0c6f792c929d318dce46140331521da_elex_wannacry.exe
Size 148KB
Sample261024-akx44aws4m
SHA256 1f2a4ffa8c281c32d89bd9869758c7692827cc36b53b7fc6594c21975983bde7
MD5 b0c6f792c929d318dce46140331521da
SHA1 52c0b8061e082f15d3751141c57630d03c4fce19
SHA512 ab2e453b2f53b476f953f9670c2ca87dff3a5283b036d6a2742e0333c8db2aca5927956fdaed362dcf629852556e658c0106a2def840c4094485b2502f2b7d5d
SSDEEP 768:GZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHFOm4a4RjF+S7wp5:yLsF2Kerc64sTiX2IV0DpKOmEQkwp5
TLSH
T17DE3A0B629761011C48BD478E9186A60B932CCF53BF75353E3017AAC9AB4C538FDE8C6
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/3080-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x0005000000023243-4.dat	family_juko
behavioral1/memory/2736-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/3080-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/2736-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x0008000000024340-16.dat	family_juko
behavioral1/memory/3068-19-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/3068-20-0x0000000000400000-0x0000000000425000-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-1-5-21-939655444-3071939294-1401108526-1000\Control Panel\International\Geo\Nation	2026-10-22_b0c6f792c929d318dce46140331521da_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-939655444-3071939294-1401108526-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2736	WINWORD.exe
3068	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-1-5-21-939655444-3071939294-1401108526-1000\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
4272	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\Domain	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	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	2026-10-22_b0c6f792c929d318dce46140331521da_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
4272	cmd.exe
4080	PING.EXE
1416	PING.EXE
3736	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1416	PING.EXE
3736	PING.EXE
4080	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3080 wrote to memory of 2736	3080	2026-10-22_b0c6f792c929d318dce46140331521da_elex_wannacry.exe	86
PID 2736 wrote to memory of 4272	2736	WINWORD.exe	87
PID 4272 wrote to memory of 4080	4272	cmd.exe	89
PID 4272 wrote to memory of 1416	4272	cmd.exe	90
PID 4272 wrote to memory of 3736	4272	cmd.exe	93
PID 4272 wrote to memory of 3068	4272	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-10-22_b0c6f792c929d318dce46140331521da_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_b0c6f792c929d318dce46140331521da_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3080
- 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:2736
- - 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\00003953" 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:4272
  - - 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:4080
  - - 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:1416
  - - 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:3736
  - - 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:3068

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

00003953

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003953
Size 148KB
SHA256 944fe54e43c227862eb795cea07575e9780d8638eca63df479c49809183adeb5
MD5 b81736428e52de124526760543d09b48
SHA1 39ea5192e4737abab8952c63d423007e4ded6078
SHA512 2fc7dfc6244b7fe8c311da714b93e60a330609e8393b037d03cd488e9cc37c99780e119ac674a5f411dd4f4e6bedc06afe3e37235daa4d88fd425e6e8331d8aa
SSDEEP 768:GZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHFOm4a4RjF+S7wpy:yLsF2Kerc64sTiX2IV0DpKOmEQkwpy
TLSH
T15DE3A0B629761011C48BD478E9186A60B932CCF53BF75353E3017AAC9AB4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 148KB
SHA256 1f2a4ffa8c281c32d89bd9869758c7692827cc36b53b7fc6594c21975983bde7
MD5 b0c6f792c929d318dce46140331521da
SHA1 52c0b8061e082f15d3751141c57630d03c4fce19
SHA512 ab2e453b2f53b476f953f9670c2ca87dff3a5283b036d6a2742e0333c8db2aca5927956fdaed362dcf629852556e658c0106a2def840c4094485b2502f2b7d5d
SSDEEP 768:GZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHFOm4a4RjF+S7wp5:yLsF2Kerc64sTiX2IV0DpKOmEQkwp5
TLSH
T17DE3A0B629761011C48BD478E9186A60B932CCF53BF75353E3017AAC9AB4C538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2736-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2736-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3068-19-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3068-20-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3080-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3080-12-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads