Office (OLE) / .XLS malware analysis — malicious · 0a36222a562ebd2e

MALICIOUS

Office (OLE) / .XLS

144.0 KB Created: 2020-06-23 09:12:14 Authoring application: Microsoft Excel

MD5: 659b2fa75d31317303c1c2719757d931 SHA-1: 0c242622c306d9cb00ee0117b94c6396af1fb924 SHA-256: 0a36222a562ebd2e8cf7fb55600dd0aa312aaeec1499280240088543828c35d0

328 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a malicious Excel file containing VBA macros. The Workbook_Open macro attempts to download a second-stage payload from the URL 'http://fyf/sfwqPmQjmp0fqpsu0yn/tpdjhsvsjvrtpqjvrf00;tquui' and save it as 'AppData\Module1.exe'. This is a common technique for delivering malware via spearphishing attachments.

Heuristics 9

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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` `43044a21584fe526fbbe305f1def0c4cebbcbc559c888596f0f0354b560244f5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	16794 bytes

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