juko | aa77b329d9f9e92c55dfe1b4fa9d61a1e71aac29d93ed3ca52f1ccbfe3e0eeb7

General

Target
2026-08-12_05fad6c4658b5cdbe05c389027754805_elex_wannacry.exe
Size 64KB
Sample260813-cdme5azcka
SHA256 aa77b329d9f9e92c55dfe1b4fa9d61a1e71aac29d93ed3ca52f1ccbfe3e0eeb7
MD5 05fad6c4658b5cdbe05c389027754805
SHA1 d7b0994e8c62ad2876e9b1dd9addcc220c15644d
SHA512 c5f9e0f0fe2f0e48d0788c94d135ca1ec58dd01f18e109cb05a53f22ea019f84d74487ae2819b4a3dd1adbf04ae045cf8f8ac0b2b1495a3b7bf4fb8b99111154
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uT:sLy2Kerc64CiGIm8so28T
TLSH
T1E4535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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 2 IoCs

resource	yara_rule
behavioral2/files/0x001200000001b1a4-4.dat	family_juko
behavioral2/files/0x000d00000001c64e-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3124	WINWORD.exe
4564	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-1-5-21-1079202589-886135813-2527035092-1000\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
4276	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	2026-08-12_05fad6c4658b5cdbe05c389027754805_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
4092	PING.EXE
4276	cmd.exe
256	PING.EXE
800	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
256	PING.EXE
800	PING.EXE
4092	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4280 wrote to memory of 3124	4280	2026-08-12_05fad6c4658b5cdbe05c389027754805_elex_wannacry.exe	89
PID 3124 wrote to memory of 4276	3124	WINWORD.exe	90
PID 4276 wrote to memory of 256	4276	cmd.exe	92
PID 4276 wrote to memory of 800	4276	cmd.exe	93
PID 4276 wrote to memory of 4092	4276	cmd.exe	94
PID 4276 wrote to memory of 4564	4276	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-12_05fad6c4658b5cdbe05c389027754805_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-12_05fad6c4658b5cdbe05c389027754805_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4280
- 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:3124
- - 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\00002577" 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:4276
  - - 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:256
  - - 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:800
  - - 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:4092
  - - 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:4564

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

00002577

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002577
Size 64KB
SHA256 db69c14b6588ae990e672e2f3cb1ec7dc115e88aaac8ff0d57194e91232ae20d
MD5 dcc8993b74702c75a726f5bd3f8209bd
SHA1 f8181b96171bb17caa5d8304b07e5a33302c75b4
SHA512 0f2a6db01b03c1a76ba940157d9ac1b28285da028bbbf2ee65329f8af9a4f7004208f018e8ee3dfcb819f0bccd4f510297336ee96712b0c37f71cba8d4d22554
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u7:sLy2Kerc64CiGIm8so287
TLSH
T1D9535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 aa77b329d9f9e92c55dfe1b4fa9d61a1e71aac29d93ed3ca52f1ccbfe3e0eeb7
MD5 05fad6c4658b5cdbe05c389027754805
SHA1 d7b0994e8c62ad2876e9b1dd9addcc220c15644d
SHA512 c5f9e0f0fe2f0e48d0788c94d135ca1ec58dd01f18e109cb05a53f22ea019f84d74487ae2819b4a3dd1adbf04ae045cf8f8ac0b2b1495a3b7bf4fb8b99111154
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uT:sLy2Kerc64CiGIm8so28T
TLSH
T1E4535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads