juko | d0ce31a34b980dfcf8d026690b9746e779b8688ff75d1af6bd3d55d986334ec0

Analysis

max time kernel
149s
max time network
154s
platform
windows11-21h2_x64
resource
win11-20260130-en
resource tags

arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
05/05/2026, 11:30

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General

Target
2026-05-05_aaf02a8eb68c425f90fb61cda9a09a95_elex_wannacry.exe
Size 88KB
Sample260505-nmjldad16w
SHA256 d0ce31a34b980dfcf8d026690b9746e779b8688ff75d1af6bd3d55d986334ec0
MD5 aaf02a8eb68c425f90fb61cda9a09a95
SHA1 4731c3c5a2052cc156ee944d39ef76812fb56e19
SHA512 95e517cc2479273aea66fe07e5050e7b536f659def688c37f9755679a639a5f1010907bdd3166ae3a402f538e297b9ba7e08270634c3147b4bb76051f844780e
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs1:zLy2Kerc64CiGImHc/28wzCBlycJWeey
TLSH
T141933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/1056-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x001300000001047e-5.dat	family_juko
behavioral2/memory/1056-13-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/3972-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x001e00000002b2db-17.dat	family_juko
behavioral2/memory/1616-19-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/1616-28-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3972	WINWORD.exe
1616	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-1-5-21-3119821332-640943685-2562343641-1000\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

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	2026-05-05_aaf02a8eb68c425f90fb61cda9a09a95_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
4668	cmd.exe
3156	PING.EXE
3396	PING.EXE
4340	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3156	PING.EXE
3396	PING.EXE
4340	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1056 wrote to memory of 3972	1056	2026-05-05_aaf02a8eb68c425f90fb61cda9a09a95_elex_wannacry.exe	79
PID 3972 wrote to memory of 4668	3972	WINWORD.exe	80
PID 4668 wrote to memory of 3156	4668	cmd.exe	82
PID 4668 wrote to memory of 3396	4668	cmd.exe	83
PID 4668 wrote to memory of 4340	4668	cmd.exe	84
PID 4668 wrote to memory of 1616	4668	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-05_aaf02a8eb68c425f90fb61cda9a09a95_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-05_aaf02a8eb68c425f90fb61cda9a09a95_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1056
- 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:3972
- - 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\00005CEB" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4668
  - - 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:3156
  - - 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:3396
  - - 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:4340
  - - 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:1616

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00005CEB

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005CEB
Size 88KB
SHA256 4dade951e88f07f47879b4c871b42a5194f22ba4c46fd960cc7d7701829b4298
MD5 284b4611e557325a8cfb8a4a2c1bc31b
SHA1 7bca70ebd4592e00505a0b2ff01de3b1b2e48b90
SHA512 fafd269ef548a7d31c515a24fd32bde4e3a7ec094845a159997ef860ab856f0258eb1217913af62c2a996f5669484c138537d608d1e84be0c2c9021bab1c2693
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsS:zLy2Kerc64CiGImHc/28wzCBlycJWeel
TLSH
T1D2933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 d0ce31a34b980dfcf8d026690b9746e779b8688ff75d1af6bd3d55d986334ec0
MD5 aaf02a8eb68c425f90fb61cda9a09a95
SHA1 4731c3c5a2052cc156ee944d39ef76812fb56e19
SHA512 95e517cc2479273aea66fe07e5050e7b536f659def688c37f9755679a639a5f1010907bdd3166ae3a402f538e297b9ba7e08270634c3147b4bb76051f844780e
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs1:zLy2Kerc64CiGImHc/28wzCBlycJWeey
TLSH
T141933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1056-12-0x0000000000860000-0x0000000000972000-memory.dmp

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memory/1056-0-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/1056-13-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/1616-19-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/1616-20-0x00000000009D0000-0x0000000000AE2000-memory.dmp

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memory/1616-28-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/1616-30-0x00000000009D0000-0x0000000000AE2000-memory.dmp

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memory/1616-33-0x00000000009D0000-0x0000000000AE2000-memory.dmp

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memory/1616-34-0x00000000009D0000-0x0000000000AE2000-memory.dmp

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memory/3972-15-0x00000000008B0000-0x00000000009C2000-memory.dmp

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memory/3972-16-0x0000000000400000-0x000000000042A000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads