juko | a258e818e2c6305d058fe8fd979c2a26b553c1cde38054adff5a01860d686e3e

General

Target
2026-08-04_6c89f26b6d785ca2aee6bb5134a06c40_elex_wannacry.exe
Size 49KB
Sample260804-hpsdeatcqd
SHA256 a258e818e2c6305d058fe8fd979c2a26b553c1cde38054adff5a01860d686e3e
MD5 6c89f26b6d785ca2aee6bb5134a06c40
SHA1 3f14dcd8710eadb557e106ec5f1b7f37e1052cb2
SHA512 b8b5d907d3aadd955b99c836be23c5b8ae3183a98e1e8906a2c662020391cdc252f266463403daf934c1d16c3c63f4b0bc476655952de3845eba2e27dc857d40
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2F:VLy2Kerc64CiGImVu8p4kojWh2F
TLSH
T13F334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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
behavioral2/memory/7000-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001300000001157e-5.dat	family_juko
behavioral2/memory/7000-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1148-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c485-13.dat	family_juko
behavioral2/memory/3436-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3436-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1148	WINWORD.exe
3436	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-1-5-21-1014449518-1831897916-4205727055-1000\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
4052	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	2026-08-04_6c89f26b6d785ca2aee6bb5134a06c40_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
3544	PING.EXE
4048	PING.EXE
4052	cmd.exe
3928	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3544	PING.EXE
4048	PING.EXE
3928	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 7000 wrote to memory of 1148	7000	2026-08-04_6c89f26b6d785ca2aee6bb5134a06c40_elex_wannacry.exe	90
PID 1148 wrote to memory of 4052	1148	WINWORD.exe	91
PID 4052 wrote to memory of 3928	4052	cmd.exe	93
PID 4052 wrote to memory of 3544	4052	cmd.exe	94
PID 4052 wrote to memory of 4048	4052	cmd.exe	95
PID 4052 wrote to memory of 3436	4052	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-04_6c89f26b6d785ca2aee6bb5134a06c40_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_6c89f26b6d785ca2aee6bb5134a06c40_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:7000
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1148
- - 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\00002AC6" 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:4052
  - - 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:3928
  - - 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:3544
  - - 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:4048
  - - 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:3436

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

00002AC6

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002AC6
Size 49KB
SHA256 c161760edf6df75b6b2eb084e2761e1970ef28a5c300d52a8437fa75946c605d
MD5 a006fe2dd747bbd95b337a76f999567c
SHA1 af021a869d2a5ac8d77f7ea24eb27ede451bd633
SHA512 ccfea3a925f8b5083663f8f693e4e519a9f1ee8b2d6d54296c3a91b66d092c9c5736398a208038fdaad6bcbb806e6737563cc3b54ed90945c7d072fa4e5f74f4
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2d:VLy2Kerc64CiGImVu8p4kojWh2d
TLSH
T115334D0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 a258e818e2c6305d058fe8fd979c2a26b553c1cde38054adff5a01860d686e3e
MD5 6c89f26b6d785ca2aee6bb5134a06c40
SHA1 3f14dcd8710eadb557e106ec5f1b7f37e1052cb2
SHA512 b8b5d907d3aadd955b99c836be23c5b8ae3183a98e1e8906a2c662020391cdc252f266463403daf934c1d16c3c63f4b0bc476655952de3845eba2e27dc857d40
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2F:VLy2Kerc64CiGImVu8p4kojWh2F
TLSH
T13F334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1148-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3436-15-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3436-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/7000-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/7000-10-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads