Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 2e37f24456d28e7a…

MALICIOUS

Office (OLE) / .XLS

3.44 MB Created: 2012-03-06 05:26:30
MD5: 472433adc6758a5071b05d643405484e SHA-1: d340beac2acdf0b5ec552fed1e7166eb6717b0e5 SHA-256: 2e37f24456d28e7aeb3e3821d9ff9ce33825ab4d796b7f182b0de4874683b481
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The XLS file contains a Workbook_Open VBA macro that utilizes WScript.Shell to execute commands. This macro is designed to prompt the user to enable content, a common lure. The primary IOC is the URL http://www.frez.co.uk, which is likely used to download a secondary payload. The presence of WScript.Shell and Shell() calls strongly indicates an attempt to download and execute further malicious code.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
    URL http://www.frez.co.uk
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
    URL http://www.frez.co.uk
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
    URL http://www.frez.co.uk

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
fe0bc230a7ac5e074812e42dfda3360734f2fcd7508336d1813f1a794a64a3ac		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1117917 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 15 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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