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gamut.md

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ID X0006
Aliases Bobax
Platforms Windows
Year 2014
Associated ATT&CK Software None

Gamut

Gamut is a spamming botnet.

ATT&CK Techniques

Name Use
Command and Control::Application Layer Protocol::Web Protocols (T1071.001) The malware uses HTTP for command and control. [1]
Defense Evasion::File and Directory Permissions Modification (T1222) Gamut sets file attributes. [3]
Execution::Shared Modules (T1129) Gamut links functions at runtime on Windows. [3]

Enhanced ATT&CK Techniques

Name Use
Defense Evasion::Modify Registry (E1112) The malware adds a registry key. [1]
Defense Evasion::Obfuscated Files or Information::Encoding-Standard Algorithm (E1027.m02) Gamut encodes data using XOR. [3]
Discovery::Application Window Discovery::Window Text (E1010.m01) Gamut gets a graphical window text. [3]
Command and Control::Ingress Tool Transfer (E1105) The malware receives files from C2. [1]
Discovery::File and Directory Discovery (E1083) Gamut gets common file paths. [3]
Discovery::System Information Discovery (E1082) Gamut queries environment variables. [3]
Execution::Command and Scripting Interpreter (E1059) Gamut accepts command line arguments. [3]

MBC Behaviors

Name Use
Execution::Send Email (B0020) Gamut probes the infected system's SMTP port 25 by sending a test SMTP transaction to mail.ru and hotmail.com. If port 25 is open, the bot requests the spam template and email list, which it uses to send spam. [1]
Anti-Behavioral-Analysis::Debugger Detection::Interruption (B0001.006) The malware detects debuggers using an INT 03h trap. [1]
Anti-Behavioral-Analysis::Debugger Detection::IsDebuggerPresent (B0001.008) The malware detects debuggers using IsDebuggerPresent. [1]
Command and Control::C2 Communication::Receive Data (B0030.002) The malware receives data from C2. [1]
Command and Control::C2 Communication::Server to Client File Transfer (B0030.003) The malware receives files from C2. [1]
Impact::Spamming (B0039) If port 25 is open, the bot uses a spam template and email list to send spam. [1]
Data::Checksum::CRC32 (C0032.001) Gamut hashes data with CRC32. [3]
Data::Encode Data::XOR (C0026.002) Gamut encodes data using XOR. [3]
Discovery::Code Discovery::Enumerate PE Sections (B0046.001) Enumerate PE sections (This capa rule had 1 match) [3]
Execution::Install Additional Program (B0023) Gamut contains an embedded PE file. [3]
File System::Create Directory (C0046) Gamut creates directories. [3]
File System::Delete Directory (C0048) Gamut deletes directories. [3]
File System::Delete File (C0047) Gamut deletes file. [3]
File System::Get File Attributes (C0049) Gamut gets file attributes. [3]
File System::Move File (C0063) Gamut moves files. [3]
File System::Read File (C0051) Gamut reads files on Windows. [3]
File System::Set File Attributes (C0050) Gamut sets file attributes. [3]
File System::Write File (C0052) Gamut writes files on Windows. [3]
Operating System::Registry::Delete Registry Key (C0036.002) Gamut deletes registry keys. [3]
Operating System::Registry::Delete Registry Value (C0036.007) Gamut deletes registry values. [3]
Operating System::Registry::Query Registry Key (C0036.005) Gamut queries or enumerates registry keys. [3]
Operating System::Registry::Query Registry Value (C0036.006) Gamut queries or enumerates registry values. [3]
Operating System::Registry::Set Registry Key (C0036.001) Gamut sets registry values. [3]
Process::Create Process (C0017) Gamut creates processes on Windows. [3]
Process::Set Thread Local Storage Value (C0041) Gamut sets thread local storage values. [3]

Indicators of Compromise

SHA256 Hashes

  • a56162bc623841102301df8e5c918f27fe8c2a58ae049d81c838fcf256654932
  • 1a9c4807500d25e83c456185a6b4571108e0f00c45667b520725ca8ae6f34fa4

References

[1] https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/gamut-spambot-analysis/

[2] https://any.run/report/a56162bc623841102301df8e5c918f27fe8c2a58ae049d81c838fcf256654932/1a6f6db3-83d5-442e-8f0d-42cfab2e0d34

[3] capa v4.0, analyzed at MITRE on 10/12/2022