juko | 4ee9d6b51dbbf94233caf8eafee32360988ad91c080d255a3a2ed80c8c3b3f82

General

Target
2026-08-14_9959cfddb468f8d721e2b8cc1513703a_elex_wannacry.exe
Size 64KB
Sample260814-byvfsssscv
SHA256 4ee9d6b51dbbf94233caf8eafee32360988ad91c080d255a3a2ed80c8c3b3f82
MD5 9959cfddb468f8d721e2b8cc1513703a
SHA1 9ba8cc24c951988842be883926754aed17034b98
SHA512 adff7784eaf77a0c327adb9a023386fe1f236074a4595a0fecd8dc9d53bd57f893c5915d043593cb4009c62a58eeee477bbee129696f5e4a59c3b77bad7d47a9
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uZ:sLy2Kerc64CiGIm8so28Z
TLSH
T1E0535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x0010000000016cdb-4.dat	family_juko
behavioral2/files/0x000e00000001c4b6-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5076	WINWORD.exe
4104	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-1-5-21-3989226554-2204910950-1522900112-1000\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
1732	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	2026-08-14_9959cfddb468f8d721e2b8cc1513703a_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
1356	PING.EXE
1804	PING.EXE
1732	cmd.exe
3696	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3696	PING.EXE
1356	PING.EXE
1804	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1100 wrote to memory of 5076	1100	2026-08-14_9959cfddb468f8d721e2b8cc1513703a_elex_wannacry.exe	89
PID 5076 wrote to memory of 1732	5076	WINWORD.exe	90
PID 1732 wrote to memory of 3696	1732	cmd.exe	92
PID 1732 wrote to memory of 1356	1732	cmd.exe	93
PID 1732 wrote to memory of 1804	1732	cmd.exe	94
PID 1732 wrote to memory of 4104	1732	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-14_9959cfddb468f8d721e2b8cc1513703a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-14_9959cfddb468f8d721e2b8cc1513703a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1100
- 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:5076
- - 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\00007A0F" 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:1732
  - - 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:3696
  - - 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:1356
  - - 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:1804
  - - 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:4104

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

00007A0F

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007A0F
Size 64KB
SHA256 aaa30f39591d939b67a5523173029c8a5dc796531cba687cca26456d1d788246
MD5 991673abe875cfef0938655d8f600380
SHA1 ede54f26cde403f667d5ad7d593364ed9e69ccd2
SHA512 74f27c64ee6d153b0f021a0e9516b87445bbf1b9cd6c2fc508494e7d18abb2890f8c68f4fe4e4f7b08269a44456936c25ed2d3f9531078f3009786db1c0ef86b
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uK:sLy2Kerc64CiGIm8so28K
TLSH
T1AC535C2EA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 4ee9d6b51dbbf94233caf8eafee32360988ad91c080d255a3a2ed80c8c3b3f82
MD5 9959cfddb468f8d721e2b8cc1513703a
SHA1 9ba8cc24c951988842be883926754aed17034b98
SHA512 adff7784eaf77a0c327adb9a023386fe1f236074a4595a0fecd8dc9d53bd57f893c5915d043593cb4009c62a58eeee477bbee129696f5e4a59c3b77bad7d47a9
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uZ:sLy2Kerc64CiGIm8so28Z
TLSH
T1E0535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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