juko | 7ac8512f23d0a6ba6557ec2fcd01b27fedb1cd5003dfd000ad207397d361e7a7

General

Target
2026-09-04_7b3954a89235d740369ff42a66b1c9e0_elex_wannacry.exe
Size 88KB
Sample260905-gp615afl6z
SHA256 7ac8512f23d0a6ba6557ec2fcd01b27fedb1cd5003dfd000ad207397d361e7a7
MD5 7b3954a89235d740369ff42a66b1c9e0
SHA1 b2f9f80545160e10c9e6d5c8971ddcdcdef23578
SHA512 5ac61dfca9a6fa5b16b4fb8defd3e70b75d9495e4a57efcce45316654ad96c9ee8965a3068f7a9f363b68ab6cc3c0119f16ff8c92ed260834f089310b3511147
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs+:zLy2Kerc64CiGImHc/28wzCBlycJWeeJ
TLSH
T1F9933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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
behavioral1/memory/3916-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x000600000001690d-5.dat	family_juko
behavioral1/memory/3916-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/64-14-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x0008000000024432-15.dat	family_juko
behavioral1/memory/4252-17-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/4252-18-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	2026-09-04_7b3954a89235d740369ff42a66b1c9e0_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
64	WINWORD.exe
4252	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-1-5-21-204488895-2999877624-296153668-1000\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
4276	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	2026-09-04_7b3954a89235d740369ff42a66b1c9e0_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
4276	cmd.exe
4292	PING.EXE
3416	PING.EXE
2128	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3416	PING.EXE
2128	PING.EXE
4292	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3916 wrote to memory of 64	3916	2026-09-04_7b3954a89235d740369ff42a66b1c9e0_elex_wannacry.exe	86
PID 64 wrote to memory of 4276	64	WINWORD.exe	87
PID 4276 wrote to memory of 4292	4276	cmd.exe	89
PID 4276 wrote to memory of 3416	4276	cmd.exe	90
PID 4276 wrote to memory of 2128	4276	cmd.exe	91
PID 4276 wrote to memory of 4252	4276	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-09-04_7b3954a89235d740369ff42a66b1c9e0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-04_7b3954a89235d740369ff42a66b1c9e0_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3916
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:64
- - 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\000043C5" 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:4276
  - - 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:4292
  - - 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:3416
  - - 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:2128
  - - 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:4252

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

000043C5

Path C:\Users\Admin\AppData\Roaming\Mozilla\000043C5
Size 88KB
SHA256 d9672621b43b1e088a08211ebadb9c9834d62c02448f7e8e6d7b9d2b3e4768c1
MD5 d7a29a4f86fb66b4586f1498d6580e7f
SHA1 78084bb95ea7fae82e0baa4b98029bbaaed8ab64
SHA512 7252b4d2dfea6f98b8f85a731776328c9236aa5837eeadb10ea520cc1579cf3d80ee101441bac0450f56b8d15c877ede5d8e0db3fdd1c912765843445e7bea44
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsY:zLy2Kerc64CiGImHc/28wzCBlycJWeeT
TLSH
T16A933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 7ac8512f23d0a6ba6557ec2fcd01b27fedb1cd5003dfd000ad207397d361e7a7
MD5 7b3954a89235d740369ff42a66b1c9e0
SHA1 b2f9f80545160e10c9e6d5c8971ddcdcdef23578
SHA512 5ac61dfca9a6fa5b16b4fb8defd3e70b75d9495e4a57efcce45316654ad96c9ee8965a3068f7a9f363b68ab6cc3c0119f16ff8c92ed260834f089310b3511147
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs+:zLy2Kerc64CiGImHc/28wzCBlycJWeeJ
TLSH
T1F9933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/64-14-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/3916-0-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/3916-12-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/4252-17-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/4252-18-0x0000000000400000-0x000000000042A000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads