juko | fc87b2a36c8fe3a67ff7986bcec0114673877cfb574d80516b8974def10aff82

General

Target
2026-09-08_11dc2fe64913f417c8566c1ede819a9e_elex_wannacry.exe
Size 88KB
Sample260910-jay33shp3t
SHA256 fc87b2a36c8fe3a67ff7986bcec0114673877cfb574d80516b8974def10aff82
MD5 11dc2fe64913f417c8566c1ede819a9e
SHA1 144e0f5fcd8ef0634a5cc6c73ea67c836fa8e341
SHA512 f8039337f0e7ce18b7640f4e32a2aeec694e4651943d7980898802c7f19cda68961e2d52a5d5b74ffdbd56704660da58174705f151c844febdbcbe56e0bb42d8
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsi:zLy2Kerc64CiGImHc/28wzCBlycJWee5
TLSH
T1DC933B2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/5164-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c4bd-3.dat	family_juko
behavioral2/memory/5164-9-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/3528-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c4be-13.dat	family_juko
behavioral2/memory/3304-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/3304-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3528	WINWORD.exe
3304	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-1-5-21-1738198120-2966725515-3980530802-1000\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
5020	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	2026-09-08_11dc2fe64913f417c8566c1ede819a9e_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
260	PING.EXE
5020	cmd.exe
5032	PING.EXE
4984	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5032	PING.EXE
4984	PING.EXE
260	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5164 wrote to memory of 3528	5164	2026-09-08_11dc2fe64913f417c8566c1ede819a9e_elex_wannacry.exe	89
PID 3528 wrote to memory of 5020	3528	WINWORD.exe	90
PID 5020 wrote to memory of 5032	5020	cmd.exe	92
PID 5020 wrote to memory of 4984	5020	cmd.exe	93
PID 5020 wrote to memory of 260	5020	cmd.exe	94
PID 5020 wrote to memory of 3304	5020	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-09-08_11dc2fe64913f417c8566c1ede819a9e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-08_11dc2fe64913f417c8566c1ede819a9e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5164
- 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:3528
- - 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\000005DA" 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:5020
  - - 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:5032
  - - 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:4984
  - - 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:260
  - - 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:3304

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

000005DA

Path C:\Users\Admin\AppData\Roaming\Mozilla\000005DA
Size 88KB
SHA256 a9854ed17dede3c9da8c3367ebc0ec08bf535a30e0c671943b8c23810e22fcd9
MD5 b6510991a512893e2d796d2137a538a1
SHA1 4207189a7a946e63fd0abf8e16abe01a40071372
SHA512 fb9d780f95f80263ce54278e927f86172644ece6624a0ff08c6396690c888a99bcf29479353fa1f7981800ef2680627b8806c5fc2f16453a43f25cc6e0b0c5e5
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsX:zLy2Kerc64CiGImHc/28wzCBlycJWeew
TLSH
T127933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 fc87b2a36c8fe3a67ff7986bcec0114673877cfb574d80516b8974def10aff82
MD5 11dc2fe64913f417c8566c1ede819a9e
SHA1 144e0f5fcd8ef0634a5cc6c73ea67c836fa8e341
SHA512 f8039337f0e7ce18b7640f4e32a2aeec694e4651943d7980898802c7f19cda68961e2d52a5d5b74ffdbd56704660da58174705f151c844febdbcbe56e0bb42d8
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsi:zLy2Kerc64CiGImHc/28wzCBlycJWee5
TLSH
T1DC933B2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3304-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3304-16-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3528-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5164-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/5164-9-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads