b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f

General

Target
b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
Size 75KB
Sample241110-byd4tawkav
SHA256 b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f
MD5 24370f3376c09a5cc80d9672c5010dd3
SHA1 5d40eac4b6577353d78025176b3bcf2385d856c3
SHA512 f4eb64604d15e4b5065b137e1fde01bbe39c9af42fdbf7fe94960af430a9c557dbcba4d8339eeeefcd302ee4c3472c075793f0e7f73c4c9aad49da5b4e816ffc
SSDEEP 1536:RshfSWHHNvoLqNwDDGw02eQmh0HjWOZ/l:GhfxHNIreQm+HiA/l
MD5 SHA1 SHA512 SSDEEP

Score

7^/10

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
2904	rundll32.exe

Loads dropped DLL 2 IoCs

pid	Process
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe

Modifies system executable filetype association 2 TTPs 5 IoCs

persistence

Modify Registry

T1112

Change Default File Association

T1546.001

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*"	rundll32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*"	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*"	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\¢«.exe	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
File created	C:\Windows\SysWOW64\¢«.exe	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
File opened for modification	C:\Windows\SysWOW64\notepad¢¬.exe	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
File created	C:\Windows\SysWOW64\notepad¢¬.exe	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system\rundll32.exe	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
File opened for modification	C:\Windows\system\rundll32.exe	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe

System Location Discovery: System Language Discovery 1 TTPs 2 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	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Modifies registry class 15 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Classes\MSipv\MainUp = "1731202373"	rundll32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\txtfile\shell\open\command	rundll32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*"	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\txtfile\shell\open\command\ = "notepad.exe %1"	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*"	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Classes\MSipv\MainVer = "506"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "¢« \"%1\" %*"	rundll32.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Classes\MSipv\MainSetup = "1731202373"	rundll32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\MSipv	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
Key created	\REGISTRY\MACHINE\Software\Classes\txtfile\shell\open\command	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\txtfile\shell\open\command\ = "notepad¢¬ %1"	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
Key created	\REGISTRY\MACHINE\Software\Classes\MSipv	rundll32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\exefile\shell\open\command	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\txtfile\shell\open\command\ = "notepad¢¬ %1"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2904	rundll32.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
2904	rundll32.exe
2904	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 2760 wrote to memory of 2904	2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe	31
PID 2760 wrote to memory of 2904	2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe	31
PID 2760 wrote to memory of 2904	2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe	31
PID 2760 wrote to memory of 2904	2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe	31
PID 2760 wrote to memory of 2904	2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe	31
PID 2760 wrote to memory of 2904	2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe	31
PID 2760 wrote to memory of 2904	2760	b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe	31

C:\Users\Admin\AppData\Local\Temp\b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe
"C:\Users\Admin\AppData\Local\Temp\b72b5f48866c383cc740de002265fb8bf0a3910a7995d3c395509a291245962f.exe"
1⤵
- Loads dropped DLL
- Modifies system executable filetype association
- Drops file in System32 directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2760
- C:\Windows\system\rundll32.exe
  C:\Windows\system\rundll32.exe
  2⤵
  - Executes dropped EXE
  - Modifies system executable filetype association
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of SetWindowsHookEx
  PID:2904

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Event Triggered Execution

1

T1546

Change Default File Association

1

T1546.001

Privilege Escalation

Event Triggered Execution

1

T1546

Change Default File Association

1

T1546.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

notepad¢¬.exe

Path C:\Windows\SysWOW64\notepad¢¬.exe
Size 75KB
SHA256 1aba72d25446fb5461afec1ee20fe13fbe3513d0b997bf3cb33f65a5ce8af59b
MD5 5bf0570921a1ad7bbb8b1600df03342a
SHA1 77d0eb908287c4e29fc9056ca5752fb15bea3671
SHA512 238d26a90e4416db34ff80d17a3baf9d8481465fab9e6b4ba535488fd20dce42deabd2b2c80b64f4791894c2c882a3583fd45901506b12a1ba38293836fd68a9
SSDEEP 768:agO5xRYi+SfSWHHNvvG5bnl/NqNwsKVDstHxYD0p1aXKynF0vQmYZS0HdJnfWOPB:RshfSWHHNvoLqNwDDGw02eQmh0HjWOPB
MD5 SHA1 SHA512 SSDEEP

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rundll32.exe

Path \Windows\system\rundll32.exe
Size 82KB
SHA256 6502bd6a4ca0289792f79052ed58d3996f9eb96b143062f28ac283c7fa953357
MD5 2308ccf48bce3dd035f62fcf097acf93
SHA1 74831ace10aa88cbfa8135044c3f19e4a920a9b3
SHA512 710d399848580dcff3f2d02bdb6f4ddd4ca0ec0c0183a8e17155e79920dccea2cf44f9f2a2136781ff202cfc4d56da4b75f724698cd29cedbdad0fd1499e3d77
SSDEEP 1536:RshfSWHHNvoLqNwDDGw02eQmh0HjWOj+oaC:GhfxHNIreQm+Hi6+oaC
MD5 SHA1 SHA512 SSDEEP

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memory/2760-0-0x0000000000400000-0x0000000000415A00-memory.dmp

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memory/2760-12-0x00000000002F0000-0x0000000000306000-memory.dmp

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memory/2760-20-0x00000000002F0000-0x00000000002F2000-memory.dmp

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memory/2760-19-0x0000000000400000-0x0000000000415A00-memory.dmp

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memory/2904-21-0x0000000000400000-0x0000000000415A00-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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