juko | f0a729d6f815fa126aa0dc81685c4b13592c7f8fada970354f5af2953e969e3b

General

Target
2026-08-15_fbaae4253b29b4889dc992b9bae916c6_elex_wannacry.exe
Size 64KB
Sample260815-n6plqsfe79
SHA256 f0a729d6f815fa126aa0dc81685c4b13592c7f8fada970354f5af2953e969e3b
MD5 fbaae4253b29b4889dc992b9bae916c6
SHA1 3bc0a50418c803e5756d81d66650200f991f2424
SHA512 668a99c3e00fd427fb6fb9b3f6ec7ebeaf63ddb02696b3c51cb8155e05b779caf2605b7e9b0af71c9cd0b30d2fcb2b5638e53ead66f20405a7ce5c49d5cd3b1a
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u6:sLy2Kerc64CiGIm8so286
TLSH
T1E8535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x000d000000019cc9-4.dat	family_juko
behavioral2/files/0x000d00000001c620-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
6056	WINWORD.exe
3832	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
5324	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	2026-08-15_fbaae4253b29b4889dc992b9bae916c6_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
3356	PING.EXE
5324	cmd.exe
1532	PING.EXE
5000	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1532	PING.EXE
5000	PING.EXE
3356	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1124 wrote to memory of 6056	1124	2026-08-15_fbaae4253b29b4889dc992b9bae916c6_elex_wannacry.exe	88
PID 6056 wrote to memory of 5324	6056	WINWORD.exe	89
PID 5324 wrote to memory of 1532	5324	cmd.exe	91
PID 5324 wrote to memory of 5000	5324	cmd.exe	92
PID 5324 wrote to memory of 3356	5324	cmd.exe	93
PID 5324 wrote to memory of 3832	5324	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-15_fbaae4253b29b4889dc992b9bae916c6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-15_fbaae4253b29b4889dc992b9bae916c6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1124
- 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:6056
- - 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\00001058" 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:5324
  - - 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:1532
  - - 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:5000
  - - 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:3356
  - - 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:3832

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

00001058

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001058
Size 64KB
SHA256 b41181339b646eb92cc6b408ae620697715de81b1676b3911ac88c3a8b916b66
MD5 0f88658bff1d7b4b804826afdd98f2f5
SHA1 926d17495d36d61f879c510f1e38850b2853ba3c
SHA512 6074c06ca040c6559c6375f02998c595e11cd8a3d48ea8463b0bbfb6cee61adb12e3a1529bf6fe5ed8291fc1ec5e65500116f43fad0fb8cd7eef2ecc425f7955
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/um:sLy2Kerc64CiGIm8so28m
TLSH
T1AA535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 f0a729d6f815fa126aa0dc81685c4b13592c7f8fada970354f5af2953e969e3b
MD5 fbaae4253b29b4889dc992b9bae916c6
SHA1 3bc0a50418c803e5756d81d66650200f991f2424
SHA512 668a99c3e00fd427fb6fb9b3f6ec7ebeaf63ddb02696b3c51cb8155e05b779caf2605b7e9b0af71c9cd0b30d2fcb2b5638e53ead66f20405a7ce5c49d5cd3b1a
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u6:sLy2Kerc64CiGIm8so286
TLSH
T1E8535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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