Remcos Office (OLE) / .XLS malware analysis — malicious · bda9f794ae098d7b

MALICIOUS

Office (OLE) / .XLS

109.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2022-08-02

MD5: b914b2dc841763647c5ab64003829978 SHA-1: 405dfe6a3697a8454a45c566486417cdc4f013e0 SHA-256: bda9f794ae098d7b9b32488143e0b044295c3ed111645c9eb02f210899938d6b

160 Risk Score

Malware Insights

Remcos · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file is an Excel spreadsheet containing VBA macros. The macro uses CreateObject to instantiate a Wscript.Shell object, which is then used to execute a command. The ClamAV detection name 'Xls.Downloader.Remcos-ffff7e420001049f-9951592-0' strongly suggests the Remcos family and a downloader functionality. The script appears to construct a command string from document properties and page setup headers, likely to download and execute a payload.

Heuristics 4

ClamAV: Xls.Downloader.Remcos-ffff7e420001049f-9951592-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Remcos-ffff7e420001049f-9951592-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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` `288badf80317935387b9e2645b3cffcfb84605c528eed6b8b05aa9ac161ac1a0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1444 bytes

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