Office (OLE) / .XLSX malware analysis — malicious · 10d156606cca8b08

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 27b6cdf1e427a2c1a88a7bb344f567ff SHA-1: 92f55e882195cc6e40d839a4f4b9198cc3ee5300 SHA-256: 10d156606cca8b0825e3fcf34ae09c4ba258003cbdbae6ba8cd4540dae1fa689

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains a Workbook_Open VBA macro that executes a CreateObject call, indicative of malicious intent. The macro attempts to download and execute a second-stage payload using a batch script. The script itself contains obfuscated PowerShell commands that attempt to download payloads from multiple URLs, including 'http://youlanda.org/eln-image/n8DPZISf/'. The ClamAV detection also points to Emotet, a known downloader family.

Heuristics 6

ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
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.
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` `faf50200d5a9adeeda00cc1da1bbf8f6abf0317a1e97a58db8ae804ba12ba446`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	13985 bytes

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