juko | 5fca1ec62dd379e107405140c11c2d2411476c06d2b646f7668ff06cdf452770

General

Target
2026-08-22_9696b86f404c874602bb417cfedafefe_elex_wannacry.exe
Size 88KB
Sample260823-e5hblaej8w
SHA256 5fca1ec62dd379e107405140c11c2d2411476c06d2b646f7668ff06cdf452770
MD5 9696b86f404c874602bb417cfedafefe
SHA1 49ad79f1427a20cedc05f29e753b5f4815912db5
SHA512 00e3bdd68a3f01269842a60635de55f2393cca1e8363bceaa763b2d9a2dd9e1bd9802c4983d3e4ca3e73ad6cb2bff9eb3bd518de004fc0422c988d81706d928a
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsI:zLy2Kerc64CiGImHc/28wzCBlycJWee7
TLSH
T176933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/2124-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x000f0000000234ea-5.dat	family_juko
behavioral1/memory/2124-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/880-14-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x00090000000246f4-15.dat	family_juko
behavioral1/memory/4760-17-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/4760-18-0x0000000000400000-0x000000000042A000-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-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	2026-08-22_9696b86f404c874602bb417cfedafefe_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
880	WINWORD.exe
4760	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-1-5-21-3053180483-1881419501-3594244048-1000\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
5664	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	2026-08-22_9696b86f404c874602bb417cfedafefe_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
2500	PING.EXE
5664	cmd.exe
2612	PING.EXE
2688	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2612	PING.EXE
2688	PING.EXE
2500	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2124 wrote to memory of 880	2124	2026-08-22_9696b86f404c874602bb417cfedafefe_elex_wannacry.exe	87
PID 880 wrote to memory of 5664	880	WINWORD.exe	88
PID 5664 wrote to memory of 2612	5664	cmd.exe	90
PID 5664 wrote to memory of 2688	5664	cmd.exe	92
PID 5664 wrote to memory of 2500	5664	cmd.exe	93
PID 5664 wrote to memory of 4760	5664	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-22_9696b86f404c874602bb417cfedafefe_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-22_9696b86f404c874602bb417cfedafefe_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2124
- 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:880
- - 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\00001D10" 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:5664
  - - 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:2612
  - - 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:2688
  - - 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:2500
  - - 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:4760

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

00001D10

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001D10
Size 88KB
SHA256 b1a041487428eb5c9b66d8297cac132d314884b1640b59f22c654d59d8aedd3e
MD5 8e9a3fa435a45ca888108149c960ec50
SHA1 5d3c030b651e31e5363d9a8b273c159b796d2116
SHA512 31f7d4e4e0ae4659ddb22d8d9a452d3f4065f58de417d017763217673b90ffbfa68bb370f58911ea487878bced1bac7fd01d604965af830b5b69a210f568160c
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsM:zLy2Kerc64CiGImHc/28wzCBlycJWeeX
TLSH
T133933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 5fca1ec62dd379e107405140c11c2d2411476c06d2b646f7668ff06cdf452770
MD5 9696b86f404c874602bb417cfedafefe
SHA1 49ad79f1427a20cedc05f29e753b5f4815912db5
SHA512 00e3bdd68a3f01269842a60635de55f2393cca1e8363bceaa763b2d9a2dd9e1bd9802c4983d3e4ca3e73ad6cb2bff9eb3bd518de004fc0422c988d81706d928a
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsI:zLy2Kerc64CiGImHc/28wzCBlycJWee7
TLSH
T176933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/880-14-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2124-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/2124-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4760-17-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4760-18-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads