Gozi Office (OLE) / .XLS malware analysis — malicious · 02e4e025f94c410c

MALICIOUS

Office (OLE) / .XLS

79.0 KB Created: 2023-03-01 08:01:43 Authoring application: Microsoft Excel First seen: 2023-03-01

MD5: d750b559aad6875cce0a7ae1aee8bf60 SHA-1: fe1dfed155f3c44ade5ac4bcb97963013313f93d SHA-256: 02e4e025f94c410cc5cd07a598322e80ea8cb384b9aaccb65ffb537f37a553cc

308 Risk Score

Malware Insights

Gozi · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059.003 Windows Command Shell

The sample is an Excel document containing VBA macros that utilize the URLDownloadToFile API to download a second-stage payload. The ClamAV detection name 'Doc.Downloader.Gozi-10026044-0' strongly suggests the Gozi family. The script also uses CreateObject and Shell() calls, indicating its downloader functionality.

Heuristics 7

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
ClamAV: Doc.Downloader.Gozi-10026044-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Gozi-10026044-0
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `3a04dca1c1197c86bc5e732c4183169f5e52f7394afef92b7d4126628db6c545`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2725 bytes

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