Office (OLE) / .XLS malware analysis — malicious · 44614d1283c624fe

MALICIOUS

Office (OLE) / .XLS

149.0 KB Created: 2020-06-21 08:48:24 Authoring application: Microsoft Excel

MD5: 3651e24899cd9ae24833b182bb7464a4 SHA-1: bfe882d0e79fe9c4a93e25337f01e62b0c8b1fbc SHA-256: 44614d1283c624febcaa5ee17dcf5e9a4dc6f354dcf7fc7355e9bff3c9a013b0

368 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell

The sample is an Excel file containing VBA macros, including Workbook_Open and Auto_Open, which are commonly used for automatic execution. The document body explicitly instructs the user to 'enable content to display this transaction SWIFT,' acting as a lure. Heuristics indicate the macros reference ShellExecute and URLDownloadToFile APIs, suggesting the script's intent is to download and execute a second-stage payload. No specific family could be identified, but the techniques are consistent with macro-based downloaders.

Heuristics 10

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `01a970a073b638a816c2987d3dc935b494c738c2cad27fc23ff38fb74bccc490`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	17512 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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