juko | 6c85ee9fc7870ffedb6596df2c23eaecb84be3b1f1fff8698358fcc72cf70d2b

General

Target
2026-08-04_9e07b564f5bf4512f3d6d2e255c8ed34_elex_wannacry.exe
Size 88KB
Sample260804-gt352aeb39
SHA256 6c85ee9fc7870ffedb6596df2c23eaecb84be3b1f1fff8698358fcc72cf70d2b
MD5 9e07b564f5bf4512f3d6d2e255c8ed34
SHA1 6dd49b416a0b0a36d2743b7050d2d1793ab17592
SHA512 0368352e500855cb6f218f27ba0ae771c543b4741db6d16cae0c6236f6d0d0694d1e7dbf5b5d31d09ccac993df77fe1d854dca9385331c7b74a8c2b09ce8a458
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsQ:zLy2Kerc64CiGImHc/28wzCBlycJWeeb
TLSH
T1BD933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/1732-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x001100000001e83c-5.dat	family_juko
behavioral1/memory/1732-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/4896-14-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x0009000000024587-15.dat	family_juko
behavioral1/memory/1456-17-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/1456-18-0x0000000000400000-0x000000000042A000-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-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	2026-08-04_9e07b564f5bf4512f3d6d2e255c8ed34_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
4896	WINWORD.exe
1456	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-1-5-21-1788976790-1541110888-1636651838-1000\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
2304	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	2026-08-04_9e07b564f5bf4512f3d6d2e255c8ed34_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
2304	cmd.exe
1040	PING.EXE
840	PING.EXE
4808	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1040	PING.EXE
840	PING.EXE
4808	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1732 wrote to memory of 4896	1732	2026-08-04_9e07b564f5bf4512f3d6d2e255c8ed34_elex_wannacry.exe	84
PID 4896 wrote to memory of 2304	4896	WINWORD.exe	85
PID 2304 wrote to memory of 1040	2304	cmd.exe	87
PID 2304 wrote to memory of 840	2304	cmd.exe	92
PID 2304 wrote to memory of 4808	2304	cmd.exe	93
PID 2304 wrote to memory of 1456	2304	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-04_9e07b564f5bf4512f3d6d2e255c8ed34_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_9e07b564f5bf4512f3d6d2e255c8ed34_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1732
- 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:4896
- - 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\00007F01" 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:2304
  - - 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:1040
  - - 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:840
  - - 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:4808
  - - 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:1456

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

00007F01

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007F01
Size 88KB
SHA256 dfa4b6116238691ecf42120cda23e5b5c42d46e44c6b02954186d76749ae1303
MD5 e2c65b5e2d6c53447f8dda86fe61b1ed
SHA1 5437e631be96b1408f01587bbe207bbceaad726e
SHA512 da64c38f30a0fdabb78653f47e0f72b5d647a010fdea3558e342a85a88409419b2e9544a7784e9e692432f02d6d4ad671e2871cb4e5923c24e36d01dcc22ae55
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsw:zLy2Kerc64CiGImHc/28wzCBlycJWee3
TLSH
T168933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 6c85ee9fc7870ffedb6596df2c23eaecb84be3b1f1fff8698358fcc72cf70d2b
MD5 9e07b564f5bf4512f3d6d2e255c8ed34
SHA1 6dd49b416a0b0a36d2743b7050d2d1793ab17592
SHA512 0368352e500855cb6f218f27ba0ae771c543b4741db6d16cae0c6236f6d0d0694d1e7dbf5b5d31d09ccac993df77fe1d854dca9385331c7b74a8c2b09ce8a458
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsQ:zLy2Kerc64CiGImHc/28wzCBlycJWeeb
TLSH
T1BD933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1456-17-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/1456-18-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/1732-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/1732-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4896-14-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads