Emotet Office (OLE) / .XLSX malware analysis — malicious · cf78f19e365d2c65

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel

MD5: 3ac28355d533bba893c740790df96e6f SHA-1: 20d4699bf531c9e9bffd627634418c92cbfdc83c SHA-256: cf78f19e365d2c6585f5f92f9e32acdd5c2b8e784ecd2613ac9ea15046339bd9

240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The critical ClamAV detection and high-severity heuristics for VBA macros, Workbook_Open execution, and CreateObject calls strongly indicate malicious intent. The VBA script within 'macros.bas' is designed to download and execute a second-stage payload. It reconstructs the following URLs for this purpose: 'http://midnighitsilvercraft.com/store/wBjNOUw/NAT_05_22_2009/BI710N4cQA6R3/', 'http://temp.com/NAT_05_22_2009/BI710N4cQA6R3/', and 'https://redington.karmart'. The script also attempts to save and execute files named 'oue4hjld.vbs' and 'bhnasleil.bat' from the 'c:\programdata\' directory, which are typical behaviors for Emotet droppers.

Heuristics 6

ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `82f73d5a8ed5ff777e090fe5bc75e192bcee9cf212b97b5b5d1ea9b9bed93f23`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	52433 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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