Office (OLE) / .XLS malware analysis — malicious · b2716ac6169dc9ab

MALICIOUS

Office (OLE) / .XLS

160.0 KB Created: 2020-06-27 12:57:46 Authoring application: Microsoft Excel

MD5: 03b1061e0a0cdf717e60708f1051d156 SHA-1: 2c3a07752cb73e1b0bd80f2b6554f0ec4bed2ba8 SHA-256: b2716ac6169dc9ab6107117a9f88e4e30b1dd8cf7563f26cfec15ed3ee0fd2e0

408 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel spreadsheet containing VBA macros, including Workbook_Open and Auto_Open, which are designed to execute automatically. The presence of ShellExecute and URLDownloadToFile API calls within the VBA code indicates that the macro attempts to download and execute a secondary payload. The document body's Spanish text prompts the user to 'Enable content to display this transaction receipt', a common social engineering tactic to trick users into running malicious macros.

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.Dropper.Agent-8398418-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.Agent-8398418-0
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
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` `f15ee371d4f4627ca1bf45ae45f51c848d64f8217d5dffc36e6366201008cfbf`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	17461 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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