Office (OLE) / .XLS malware analysis — malicious · 84fe78eebf9d3e4a

MALICIOUS

Office (OLE) / .XLS

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

MD5: 6f33ff937e092a7ee9007c0e33bdccc1 SHA-1: c18fc6844914bd921640c30bf56fc53d063f7269 SHA-256: 84fe78eebf9d3e4a7d5ea36ac0dca3ea926026764390bcbff9b3de4dc81fa9f8

388 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an XLS file containing VBA macros, including a Workbook_Open auto-execute macro. This macro utilizes URLDownloadToFile, indicating it downloads and executes a second-stage payload. The document body contains a lure to 'enable content' to display a receipt, a common social engineering tactic. The presence of a Workbook_Open macro that calls URLDownloadToFile strongly suggests a downloader functionality.

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` `60456a70f47d9e0d0e7ce008d034974ef2bf34fc7ac5195b7f4fb13575493d88`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	17657 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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