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

Static analysis result for SHA-256 ec27972a900a9db0…

MALICIOUS

Office (OLE) / .XLS

147.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 58ac57098feba66b2293d5e4577f2b08 SHA-1: 51c5cc16638b46ddee23741c4a596397e395bea6 SHA-256: ec27972a900a9db0630e69d8c8923e4ec5a1797a1c06e92b944736fc9262376e
340 Risk Score

Malware Insights

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

This XLS file contains a Workbook_Open macro that utilizes WScript.Shell to execute commands. The macro appears to be obfuscated, but the presence of `CreateObject("WScript.Shell")` and `Shell()` call firings strongly suggests it's designed to download and execute a secondary payload. The initial string concatenation `Chr(50) + Chr(48) + Chr(48)` likely forms part of a command or path used in the execution.

Heuristics 8

  • 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
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8eb30bb6e09bade92a5dd32e3bf0a13436c55254228126811ccbcf4d467871b2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 16051 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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