Office (OLE) / .XLS malware analysis — malicious · d8416cb263c6c4eb

MALICIOUS

Office (OLE) / .XLS

203.0 KB Created: 2016-10-01 14:19:35 Authoring application: Microsoft Excel First seen: 2022-03-26

MD5: 851ba9c532c090c8d3877834ee8b9fa6 SHA-1: 06165da63b297b5b5c0c59fbe808ffc3a37c93fe SHA-256: d8416cb263c6c4eb87cd8e9fdcb729fa269aed2055b4aba0d4f7991515d308bf

368 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel spreadsheet containing VBA macros. The Workbook_Open macro triggers the execution of other VBA functions that utilize ShellExecuteA and URLDownloadToFileA APIs. This indicates the macro is designed to download and execute a second-stage payload from a remote source. The ClamAV detection name 'Xls.Malware.Valyria-10028013-0' further supports its malicious nature.

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` `5b9d643e1ea85952a4599d62627576ee34f9a68709d422a9a2359b3c903e03d0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	11101 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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