juko | 7705289b02c77ab400aa973a7a7f62e1e89d9050a243d6be9ea15b837b59ec9e

General

Target
2026-08-08_ab09556ee3483725df178fef22456986_elex_wannacry.exe
Size 37KB
Sample260808-kpr4raw1ht
SHA256 7705289b02c77ab400aa973a7a7f62e1e89d9050a243d6be9ea15b837b59ec9e
MD5 ab09556ee3483725df178fef22456986
SHA1 de3b1090011f1ed71706b5bb53d800540e91f687
SHA512 d9dc12248ff737b76941c7d2fe6323d08dc3c46ceb5a9accd1aaede42f34a9192ced69801ce13cd2e26ea5b58394e113cf97e991e33fcc13210a47c3e10cbc92
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywax:3LsF2Kerc64sTiX2IV0DhuogwK
TLSH
T111035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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
behavioral2/memory/4148-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000800000001b85f-5.dat	family_juko
behavioral2/memory/4148-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2400-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c583-13.dat	family_juko
behavioral2/memory/3440-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/3440-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2400	WINWORD.exe
3440	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-1-5-21-3797332335-34111092-3597280141-1000\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
2512	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	2026-08-08_ab09556ee3483725df178fef22456986_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
2512	cmd.exe
2672	PING.EXE
4824	PING.EXE
4916	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2672	PING.EXE
4824	PING.EXE
4916	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4148 wrote to memory of 2400	4148	2026-08-08_ab09556ee3483725df178fef22456986_elex_wannacry.exe	88
PID 2400 wrote to memory of 2512	2400	WINWORD.exe	89
PID 2512 wrote to memory of 2672	2512	cmd.exe	91
PID 2512 wrote to memory of 4824	2512	cmd.exe	92
PID 2512 wrote to memory of 4916	2512	cmd.exe	93
PID 2512 wrote to memory of 3440	2512	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-08_ab09556ee3483725df178fef22456986_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_ab09556ee3483725df178fef22456986_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4148
- 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:2400
- - 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\00000EF4" 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:2512
  - - 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:2672
  - - 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:4824
  - - 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:4916
  - - 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:3440

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

00000EF4

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000EF4
Size 37KB
SHA256 64a2dfa732bfc8fde684ea28e5f34834f5d214bd4b96956bd04a3dcd2ed9bfed
MD5 0a6393347bdde4a7e7277eac42a69ff8
SHA1 3de4fe0557d3e642b87e0eafcd2c84911645ae0b
SHA512 9eb14bb1ba9e9b1537fe414447f3af00d34cc7de49a163d8259831edfa4604ae0a6b1f656480fe96a7dc5db685b9daebd260213a77bd40126e3587e6ea965b2b
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywac:3LsF2Kerc64sTiX2IV0Dhuogwz
TLSH
T1CF035C1A299160A2D55310B0E9D81FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 7705289b02c77ab400aa973a7a7f62e1e89d9050a243d6be9ea15b837b59ec9e
MD5 ab09556ee3483725df178fef22456986
SHA1 de3b1090011f1ed71706b5bb53d800540e91f687
SHA512 d9dc12248ff737b76941c7d2fe6323d08dc3c46ceb5a9accd1aaede42f34a9192ced69801ce13cd2e26ea5b58394e113cf97e991e33fcc13210a47c3e10cbc92
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywax:3LsF2Kerc64sTiX2IV0DhuogwK
TLSH
T111035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2400-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3440-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3440-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4148-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4148-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads