juko | f908e32bd023c0fd6a60ac8c7852418c5d2b0b63cff49502a80a81b614f776ce

General

Target
2026-08-09_c650825ed9e890556316899b5840d2d5_elex_wannacry.exe
Size 88KB
Sample260809-emfp2szdlh
SHA256 f908e32bd023c0fd6a60ac8c7852418c5d2b0b63cff49502a80a81b614f776ce
MD5 c650825ed9e890556316899b5840d2d5
SHA1 869ba2c8e87c8c30c6634c2b83f2b0265eb6080c
SHA512 634052f2400b6c367813119d236e18f38eb20ec3624d49bcd782c41a745a8a6004329dde8fe04ac4e6189e763412c237317dae6f7e90d8946f14c4f89d032fcd
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs5:sLy2Kerc64CiGIm8so28wzCBlycJWeeC
TLSH
T103933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000c000000011377-4.dat	family_juko
behavioral2/files/0x001100000001c528-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4752	WINWORD.exe
4620	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-1-5-21-3797332335-34111092-3597280141-1000\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
1000	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-09_c650825ed9e890556316899b5840d2d5_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

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
5752	PING.EXE
1000	cmd.exe
3288	PING.EXE
3688	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3288	PING.EXE
3688	PING.EXE
5752	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6004 wrote to memory of 4752	6004	2026-08-09_c650825ed9e890556316899b5840d2d5_elex_wannacry.exe	89
PID 4752 wrote to memory of 1000	4752	WINWORD.exe	90
PID 1000 wrote to memory of 3288	1000	cmd.exe	92
PID 1000 wrote to memory of 3688	1000	cmd.exe	93
PID 1000 wrote to memory of 5752	1000	cmd.exe	94
PID 1000 wrote to memory of 4620	1000	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_c650825ed9e890556316899b5840d2d5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_c650825ed9e890556316899b5840d2d5_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6004
- 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:4752
- - 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\000047CC" 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:1000
  - - 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:3288
  - - 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:3688
  - - 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:5752
  - - 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:4620

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

000047CC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000047CC
Size 88KB
SHA256 b76c6975b63c6f56ff1e43bcab255b0a3c5ad79cf587866476b7e6306c8b5c59
MD5 0d58fa1ecaf8e9194f65ee4dbe1479bc
SHA1 440097673ec7bf1ca134d9bcad140107dfa664b8
SHA512 22bd835b0f16e9835970d463d55467f9dd01ebc624de8408827f3c342efd7c76e1092dede2060558efae643762d45b6a58bd6cfa27dee67f098e577645ffbeaf
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsc:sLy2Kerc64CiGIm8so28wzCBlycJWeer
TLSH
T156933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 f908e32bd023c0fd6a60ac8c7852418c5d2b0b63cff49502a80a81b614f776ce
MD5 c650825ed9e890556316899b5840d2d5
SHA1 869ba2c8e87c8c30c6634c2b83f2b0265eb6080c
SHA512 634052f2400b6c367813119d236e18f38eb20ec3624d49bcd782c41a745a8a6004329dde8fe04ac4e6189e763412c237317dae6f7e90d8946f14c4f89d032fcd
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs5:sLy2Kerc64CiGIm8so28wzCBlycJWeeC
TLSH
T103933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads