Office (OLE) / .XLS malware analysis — malicious · 3358c579913308c3

MALICIOUS

Office (OLE) / .XLS

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

MD5: c7e508500724f43b381649e6c169a41e SHA-1: 720043542d08945555a32182dd8e7bfb89310126 SHA-256: 3358c579913308c34f745c6cc5cb83e718956730f7d9e4f16f58bf500a7d7b07

368 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Excel spreadsheet containing VBA macros. A critical heuristic indicates the presence of URLDownloadToFile within the VBA code, and another critical heuristic confirms this is used for downloading. The Workbook_Open macro is present, suggesting automatic execution upon opening. This combination strongly indicates the file's purpose is to download and execute a secondary payload from a remote source.

Heuristics 9

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
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` `1733215eb618a009dcf8cdbfb60451e3f6b0795475f63abdb195b4d758e654a8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	11329 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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