Office (OLE) / .XLS malware analysis — malicious · 0ca956c3c9032101

MALICIOUS

Office (OLE) / .XLS

51.5 KB Created: 2023-02-15 08:27:04 Authoring application: Microsoft Excel First seen: 2023-02-16

MD5: 8e100f8349c6871a00c15461763a9014 SHA-1: 7f7f57d1e2c9482025e1141d902d4427c26d4463 SHA-256: 0ca956c3c90321013ec3c0e236871db83626976cd0fc7a683c845d3519f7ff05

248 Risk Score

Malware Insights

MITRE ATT&CK

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

The VBA macro contains calls to URLDownloadToFileA and Shell(), indicating an intent to download and execute a second-stage payload. The script constructs a path in the user's Documents folder, such as USERPROFILE\Documents\<random_name>.raw, to save the downloaded file. The use of Environ$("USERPROFILE") and Application.PathSeparator suggests a downloader functionality.

Heuristics 6

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
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` `b4cffb19183fb2ee63fdaa632ef82fb0bcb7637cacabed7fb44f138cc4dccd14`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2216 bytes

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