juko | 45f483246c150f37d39ceb8cd1372b0370cabbf657c8dda04633b42f95789584

General

Target
2026-07-28_5fe5d7545c96c58a46907c42f18f0cd8_elex_wannacry.exe
Size 37KB
Sample260728-jl2cksstdx
SHA256 45f483246c150f37d39ceb8cd1372b0370cabbf657c8dda04633b42f95789584
MD5 5fe5d7545c96c58a46907c42f18f0cd8
SHA1 f0aa1805ee39f6195785750f68715b6994191acd
SHA512 745120ce86ea7f858862ae829b60aa8009031e37eccc4bce8d64bb773fce4700e60fa123cc0d3a8fd135a2bcc8655f1411334380b6a8275a5ce92550ae4fc79a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5yway:3LsF2Kerc64sTiX2IV0Dhuogwh
TLSH
T1D3035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/3316-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x0007000000023216-5.dat	family_juko
behavioral1/memory/3316-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/5084-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000c00000002442f-15.dat	family_juko
behavioral1/memory/3528-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/3528-18-0x0000000000400000-0x000000000041D000-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-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	2026-07-28_5fe5d7545c96c58a46907c42f18f0cd8_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5084	WINWORD.exe
3528	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-1-5-21-2937465464-4167303362-2236413517-1000\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
4040	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	2026-07-28_5fe5d7545c96c58a46907c42f18f0cd8_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
4040	cmd.exe
2764	PING.EXE
696	PING.EXE
2732	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2764	PING.EXE
696	PING.EXE
2732	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3316 wrote to memory of 5084	3316	2026-07-28_5fe5d7545c96c58a46907c42f18f0cd8_elex_wannacry.exe	85
PID 5084 wrote to memory of 4040	5084	WINWORD.exe	86
PID 4040 wrote to memory of 2764	4040	cmd.exe	88
PID 4040 wrote to memory of 696	4040	cmd.exe	89
PID 4040 wrote to memory of 2732	4040	cmd.exe	90
PID 4040 wrote to memory of 3528	4040	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-07-28_5fe5d7545c96c58a46907c42f18f0cd8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-28_5fe5d7545c96c58a46907c42f18f0cd8_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3316
- 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:5084
- - 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\00005706" 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:4040
  - - 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:2764
  - - 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:696
  - - 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:2732
  - - 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:3528

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

00005706

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005706
Size 37KB
SHA256 5aa128a3644f7bd0dfc6eba4642ad34e9002b39605f49ba592e9df2ccdfcd00c
MD5 2ef8040c98eede4f9c44b9e19b641602
SHA1 2d7d8a3994005ef04d143531fc853585760d43cf
SHA512 7a7bb91962be47b96635b012497b6753f0cf3d6cbd378dc08a981506b5a256514f90713084280f7af109b2ac935a1e73435fce2da1540ec2d754f1d243d4d8d1
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa6:3LsF2Kerc64sTiX2IV0DhuogwJ
TLSH
T1E6035C1A299160A2D55310B0E9D81FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 45f483246c150f37d39ceb8cd1372b0370cabbf657c8dda04633b42f95789584
MD5 5fe5d7545c96c58a46907c42f18f0cd8
SHA1 f0aa1805ee39f6195785750f68715b6994191acd
SHA512 745120ce86ea7f858862ae829b60aa8009031e37eccc4bce8d64bb773fce4700e60fa123cc0d3a8fd135a2bcc8655f1411334380b6a8275a5ce92550ae4fc79a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5yway:3LsF2Kerc64sTiX2IV0Dhuogwh
TLSH
T1D3035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3316-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3316-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3528-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3528-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5084-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads