juko | 52b799b73248474522a958360d11725fb29b58d2e6b9583401317c48a7f6a283

General

Target
2026-08-01_d7027ce8916d9d082670da90e0c321be_elex_wannacry.exe
Size 37KB
Sample260802-egh8zssyaz
SHA256 52b799b73248474522a958360d11725fb29b58d2e6b9583401317c48a7f6a283
MD5 d7027ce8916d9d082670da90e0c321be
SHA1 5a2e4b527ec6a809a4ecc3ebe8720f578e18f9fb
SHA512 7933b6607ebf5b2808ea71bed23efc5d7fce4ff0e8236b9787d01e6c9241b557169015a7783d19a2bb65f1d76abc05b53135c06b50eb65e44ae767c58d2e8b74
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa+:3LsF2Kerc64sTiX2IV0Dhuogw1
TLSH
T1D3035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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/5800-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000d00000001af5c-5.dat	family_juko
behavioral2/memory/5800-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5260-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5ba-13.dat	family_juko
behavioral2/memory/5884-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5884-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5260	WINWORD.exe
5884	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-1-5-21-1738198120-2966725515-3980530802-1000\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
6112	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	2026-08-01_d7027ce8916d9d082670da90e0c321be_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
6112	cmd.exe
2204	PING.EXE
3564	PING.EXE
2608	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2608	PING.EXE
2204	PING.EXE
3564	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5800 wrote to memory of 5260	5800	2026-08-01_d7027ce8916d9d082670da90e0c321be_elex_wannacry.exe	89
PID 5260 wrote to memory of 6112	5260	WINWORD.exe	90
PID 6112 wrote to memory of 2204	6112	cmd.exe	92
PID 6112 wrote to memory of 3564	6112	cmd.exe	93
PID 6112 wrote to memory of 2608	6112	cmd.exe	94
PID 6112 wrote to memory of 5884	6112	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_d7027ce8916d9d082670da90e0c321be_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_d7027ce8916d9d082670da90e0c321be_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5800
- 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:5260
- - 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\00005FE8" 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:6112
  - - 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:2204
  - - 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:3564
  - - 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:2608
  - - 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:5884

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

00005FE8

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005FE8
Size 37KB
SHA256 0b46a170fd4c7444bba40ca6a1717095d94dee48417313e499e879ad59266756
MD5 dd63c23372da8e17e6576aa4ed8507ab
SHA1 3b1586014e58b9fbdda12dbdd22b49fa3f349ec5
SHA512 7336d8b586fad111a5158d7dee46028d2f52555811dcba0371ce4a6f706b8cc1d8ee36c0c9374a50de748cc1b67ff8a5e505c68ca67a1b0f0a1ca18d60abd8c0
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa2:3LsF2Kerc64sTiX2IV0DhuogwJ
TLSH
T1BB035C1A299160A2D55310B0E9D82FB4C53D8C76146BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 52b799b73248474522a958360d11725fb29b58d2e6b9583401317c48a7f6a283
MD5 d7027ce8916d9d082670da90e0c321be
SHA1 5a2e4b527ec6a809a4ecc3ebe8720f578e18f9fb
SHA512 7933b6607ebf5b2808ea71bed23efc5d7fce4ff0e8236b9787d01e6c9241b557169015a7783d19a2bb65f1d76abc05b53135c06b50eb65e44ae767c58d2e8b74
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa+:3LsF2Kerc64sTiX2IV0Dhuogw1
TLSH
T1D3035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/5260-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5800-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5800-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5884-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5884-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads