Office (OLE) / .XLS malware analysis — malicious · 35c60ec18973b446

MALICIOUS

Office (OLE) / .XLS

226.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel

MD5: 74f29f65444be18c46dba10822439239 SHA-1: 749da2b07ec99d78f0da9704100999857b5c5e1d SHA-256: 35c60ec18973b446e288ddb91636fe4f997ed9472a90c2b8772991fa73748c84

388 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1059 Command and Scripting Interpreter

The file is an Excel spreadsheet containing VBA macros, specifically a Workbook_Open macro that is auto-executed. Heuristics indicate the use of ShellExecute and URLDownloadToFile APIs within the VBA code, suggesting the macro downloads and executes a second-stage payload. The document body contains a lure to enable content, which is a common tactic for macro-based malware.

Heuristics 10

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
ClamAV: Xls.Malware.Valyria-10028013-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-10028013-0
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_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` `4ad18ffeab3ee845b4e02d78c5cca6c259ed0160c0c709a869d18c4be3a4ccd3`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	18020 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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