juko | b34180861df78385444a9e05dbbf606bb23e9cb73849aac20a76dc201851adb0

General

Target
2026-08-09_bf89da02d047aa55409cdbe24f7ec8f7_elex_wannacry.exe
Size 49KB
Sample260809-3sdpmsfm8t
SHA256 b34180861df78385444a9e05dbbf606bb23e9cb73849aac20a76dc201851adb0
MD5 bf89da02d047aa55409cdbe24f7ec8f7
SHA1 409d49ad341d3d461b27640ef89e02ac2eefb527
SHA512 bb9908fa04d049fe90d94d54c4591e2452177bf225fac1fc00f2270441bcff780688a1cdce2c2e37f23ef1c9a6cc4253dad7212265bccfb21d28ea865ccca05f
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2/:4Ly2Kerc64CiGImVu8p4kojWh2/
TLSH
T1C8334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/1012-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000600000001690d-5.dat	family_juko
behavioral1/memory/1012-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4924-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000900000002441b-15.dat	family_juko
behavioral1/memory/2104-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/2104-18-0x0000000000400000-0x0000000000420000-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	2026-08-09_bf89da02d047aa55409cdbe24f7ec8f7_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
4924	WINWORD.exe
2104	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
4304	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-09_bf89da02d047aa55409cdbe24f7ec8f7_elex_wannacry.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
4304	cmd.exe
4208	PING.EXE
4076	PING.EXE
2112	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4208	PING.EXE
4076	PING.EXE
2112	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1012 wrote to memory of 4924	1012	2026-08-09_bf89da02d047aa55409cdbe24f7ec8f7_elex_wannacry.exe	85
PID 4924 wrote to memory of 4304	4924	WINWORD.exe	86
PID 4304 wrote to memory of 4208	4304	cmd.exe	88
PID 4304 wrote to memory of 4076	4304	cmd.exe	89
PID 4304 wrote to memory of 2112	4304	cmd.exe	90
PID 4304 wrote to memory of 2104	4304	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-08-09_bf89da02d047aa55409cdbe24f7ec8f7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_bf89da02d047aa55409cdbe24f7ec8f7_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1012
- 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:4924
- - 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\000014E3" 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:4304
  - - 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:4208
  - - 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:4076
  - - 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:2112
  - - 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:2104

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

000014E3

Path C:\Users\Admin\AppData\Roaming\Mozilla\000014E3
Size 49KB
SHA256 fdbdcb13baf771cd8d333405d99dbedef1ca0ec85f6acd7090bc1fb06d2b4417
MD5 599dc62f61c3d0f1e5d3e0ea3728fd07
SHA1 231614f8f71b2323b22222092a0ecf49f5ae289e
SHA512 d39ee1ca558b1bfc2b4d2152ab9d6a9d27da3531bb91eb03b05057ea08c877e7d7084194b73325f42b0e7152424a128d5aa034fa8b921ff38b8ec36256331f99
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2u:4Ly2Kerc64CiGImVu8p4kojWh2u
TLSH
T1EB334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 b34180861df78385444a9e05dbbf606bb23e9cb73849aac20a76dc201851adb0
MD5 bf89da02d047aa55409cdbe24f7ec8f7
SHA1 409d49ad341d3d461b27640ef89e02ac2eefb527
SHA512 bb9908fa04d049fe90d94d54c4591e2452177bf225fac1fc00f2270441bcff780688a1cdce2c2e37f23ef1c9a6cc4253dad7212265bccfb21d28ea865ccca05f
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2/:4Ly2Kerc64CiGImVu8p4kojWh2/
TLSH
T1C8334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1012-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/1012-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2104-17-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2104-18-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4924-14-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads