Office (OLE) / .XLS malware analysis — malicious · 01bdbf4d48aea1c1

MALICIOUS

Office (OLE) / .XLS

18.5 KB Created: 2010-01-19 14:25:26 Authoring application: Microsoft Excel

MD5: 148062f33a16b261e7e78f2477f59976 SHA-1: 760f133e8b74b0fc8b549264e7a7e3b32167ef33 SHA-256: 01bdbf4d48aea1c1ceb7d0dfa9acbbb3caa9281b1f251867835aca9f156bcba6

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample is an Excel spreadsheet containing a VBA macro named 'auto_open'. This macro attempts to copy itself to the Excel startup folder as 'StartUp.xls', thereby establishing persistence. It also configures keyboard shortcuts to trigger further malicious actions, likely to execute a payload or evade detection. The macro's obfuscated nature and persistence mechanism suggest a downloader or droppper functionality.

Heuristics 4

ClamAV: Xls.Trojan.Escape-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Trojan.Escape-2
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `5309234b5789e0d1ed53e5edff4adb46309530da8f93beb3beddb427742d4af1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1986 bytes
Detection ClamAV: Xls.Trojan.Escape-1 Obfuscation or payload: unlikely

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