juko | 37690590461635471f3d7fa8ad2bc453fd00808b2347b23e74b9559f330f1bc3

General

Target
2026-09-20_641819b7f86ad706908ae1d935af708e_elex_wannacry.exe
Size 94KB
Sample260920-shdlsace83
SHA256 37690590461635471f3d7fa8ad2bc453fd00808b2347b23e74b9559f330f1bc3
MD5 641819b7f86ad706908ae1d935af708e
SHA1 9c6968f8589ab6e20f3770b59415cf2b48889451
SHA512 1217356450f7257439277337ed40db122cfce100c8fa730ea2eae67f692b2b5fc074f2af02bd5befe97244237ce6359ef07df661359bbfffa4861a1d42a97221
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Na:RLy2Kerc64CiGImFYgUBWTb4/Na
TLSH
T127937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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/4100-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x00060000000232b8-5.dat	family_juko
behavioral1/memory/4100-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/2392-14-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/files/0x00090000000244cf-15.dat	family_juko
behavioral1/memory/5032-17-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral1/memory/5032-18-0x0000000000400000-0x000000000042B000-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-1-5-21-524788801-3318743092-4051225893-1000\Control Panel\International\Geo\Nation	2026-09-20_641819b7f86ad706908ae1d935af708e_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-524788801-3318743092-4051225893-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2392	WINWORD.exe
5032	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-1-5-21-524788801-3318743092-4051225893-1000\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
4224	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	2026-09-20_641819b7f86ad706908ae1d935af708e_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
2432	PING.EXE
4308	PING.EXE
4224	cmd.exe
4820	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4820	PING.EXE
2432	PING.EXE
4308	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4100 wrote to memory of 2392	4100	2026-09-20_641819b7f86ad706908ae1d935af708e_elex_wannacry.exe	86
PID 2392 wrote to memory of 4224	2392	WINWORD.exe	90
PID 4224 wrote to memory of 4820	4224	cmd.exe	92
PID 4224 wrote to memory of 2432	4224	cmd.exe	93
PID 4224 wrote to memory of 4308	4224	cmd.exe	94
PID 4224 wrote to memory of 5032	4224	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-09-20_641819b7f86ad706908ae1d935af708e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-20_641819b7f86ad706908ae1d935af708e_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4100
- 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:2392
- - 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\00002366" 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:4224
  - - 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:4820
  - - 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:2432
  - - 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:4308
  - - 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:5032

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

00002366

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002366
Size 94KB
SHA256 e67bd49ba52fd31d41cc3c52eb540cba79041bcb25ac600d813000a0377ea50a
MD5 05e8c3240bf322545e44200e899ac7d7
SHA1 e89913621ee2e5b2a9b9acbfcb17d5472f75bacd
SHA512 4d080af57c61693165866beca58999b3c76209dd7c2c11acc9e0e831887e9811b97bca4e1641eac91f61b6289360a8fd8d500c3c7173ec9aea1fcc53918acf2d
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/NM:RLy2Kerc64CiGImFYgUBWTb4/NM
TLSH
T1C2937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 37690590461635471f3d7fa8ad2bc453fd00808b2347b23e74b9559f330f1bc3
MD5 641819b7f86ad706908ae1d935af708e
SHA1 9c6968f8589ab6e20f3770b59415cf2b48889451
SHA512 1217356450f7257439277337ed40db122cfce100c8fa730ea2eae67f692b2b5fc074f2af02bd5befe97244237ce6359ef07df661359bbfffa4861a1d42a97221
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Na:RLy2Kerc64CiGImFYgUBWTb4/Na
TLSH
T127937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2392-14-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4100-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4100-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5032-17-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5032-18-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads