Office (OLE) / .XLS malware analysis — malicious · ba40d672744d9fea

MALICIOUS

Office (OLE) / .XLS

38.5 KB Created: 2022-04-11 10:22:02 Authoring application: Microsoft Excel First seen: 2022-04-11

MD5: a231e99aea05aabbb7bcba6b94b05eb1 SHA-1: 4e80264adfd1135787dc1f0f95d414ab9ccea771 SHA-256: ba40d672744d9fea782381b7b609bc2cb381437d94afdaf458e17e8be0271fc2

288 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The Workbook_Open macro automatically executes upon opening the spreadsheet. It constructs a URL by concatenating hex-encoded strings, which resolves to 'https://transfer.sh/tP9R3y/BXU0E8WBWdtsMx.exe'. The script then downloads the content from this URL, saves it as 'dropper.exe' in the user's temporary directory, and executes it. This indicates a downloader functionality, likely for a second-stage payload.

Heuristics 8

ClamAV: Xls.Malware.Sload-7135989-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Sload-7135989-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
GetObject call high OLE_VBA_GETOBJ

GetObject call
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` `0027d37234e1a3ae94f1e80d9277367991b094c0df32f305cc6232a43f438834`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4486 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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