Office (OLE) / .XLS malware analysis — malicious · a5025bc0185c2790

MALICIOUS

Office (OLE) / .XLS

140.5 KB Created: 2020-06-15 12:33:20 Authoring application: Microsoft Excel

MD5: 7bbf59737f72a1f35f68295ce8db800c SHA-1: 014cbdf50943095585f734fdafa76f7cf2139e1b SHA-256: a5025bc0185c27901d9e5b0e3c45c2995753a7b7e1ac668111c303339714b43b

328 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample is an Excel file containing VBA macros, specifically a Workbook_Open macro that is configured to execute automatically. The document body contains a lure instructing the user to 'enable content to display this transaction SWIFT'. The presence of `URLDownloadToFile` API calls within the VBA code indicates that the macro is designed to download a second-stage payload from an external source. The `SC_STR_SHELLEXEC` and `OLE_VBA_PCODE_AUTOEXEC_EXEC` heuristics further confirm the execution of external commands. No specific URLs were extracted, but the presence of the `macros.bas` artifact is noted.

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` `4dae34ddb41fb03fe60310cdeb56f2b0166f0c297de1e6e5bff4f4e2acecc43b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	14412 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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