Office (OLE) / .XLS malware analysis — malicious · 3792b9f9022fcd8e

MALICIOUS

Office (OLE) / .XLS

66.5 KB Created: 2021-03-16 13:12:43 Authoring application: Microsoft Excel

MD5: 13653be1bd43539522d4e1702fe38fc5 SHA-1: bade1e77ce7c7724bdf24fe77eb5652f7f62d130 SHA-256: 3792b9f9022fcd8e0b80ec9b5a053720e0ad647b27219bc7fa7dd078f2b739bc

328 Risk Score

Malware Insights

MITRE ATT&CK

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

The XLS file contains a Workbook_Open VBA macro that utilizes URLDownloadToFile to download and execute a second-stage payload. The document body prompts the user to 'Enable content' to display the spreadsheet, indicating a social engineering lure to bypass macro security. The macro's execution of ShellExecute further supports the payload delivery intent.

Heuristics 9

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
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` `e9892ba52d71c2d96c1baf61c42f092bfbebaf7d671bac0ce7914e0ccb191263`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	14636 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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