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

Static analysis result for SHA-256 ff2b02b9c2ac72c7…

MALICIOUS

Office (OLE) / .XLS

154.5 KB Created: 2020-03-24 07:25:54 Authoring application: Microsoft Excel
MD5: 75ef73e9ba7cd65f80a0d6bce12fa18f SHA-1: 1cae4a5b6848631a1161c1b05b0817c49324f1c2 SHA-256: ff2b02b9c2ac72c7de6d372d734866405813def35162f04849fbe185e8bae9ea
420 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This Excel file contains VBA macros, including a Workbook_Open auto-exec macro that utilizes WScript.Shell to execute commands. The document body explicitly instructs the user to 'Enable content to view this payment document', indicating a social engineering lure. The presence of a 'macros.bas' file and the ClamAV detection further support its malicious nature. The primary intent appears to be downloading and executing a second-stage payload.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Xls.Macro.Obfuscation-9804250-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Macro.Obfuscation-9804250-0
  • 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
  • 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.
  • 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.
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
0c12adc7ca1e570838f359bba9628c7200040915addea5b3637193fa7126adc0		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 33520 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 71 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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