Office (OLE) / .XLSX malware analysis — malicious · 9d7791f1b2fe684a

MALICIOUS

Office (OLE) / .XLSX

698.0 KB Created: 2020-06-22 10:41:03 Authoring application: Microsoft Excel

MD5: e0e759ddea3d2d14ee2663afeaf5a718 SHA-1: 837f292d9a0f7b0c56ffc10e70ab5fc0ff52fbd1 SHA-256: 9d7791f1b2fe684a7c57e5a25a2c2827c1bb87a5a0a5783c250565a516e89841

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is an Excel spreadsheet containing a Workbook_Open VBA macro. This macro utilizes the Shell() function, indicating an attempt to execute external commands. The presence of 'wscript' and 'CreateObject' calls further suggests the macro is designed to download and execute a second-stage payload. The ClamAV detection of 'Xls.Packed.Logan-9738662-0' reinforces the malicious nature of the file. The extracted artifacts 'macros.bas' and 'ole10native_00.bin' are likely components of this malicious payload.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
ClamAV: Xls.Packed.Logan-9738662-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Packed.Logan-9738662-0
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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `c002a21b25eb16c7cf03a813431739fc85b8749f5f8d813ff87921f514f0b8e4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	22654 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`ole10native_00.bin` `50bbdd9fbbbbfb058d8ce90c36c6dd737df05c51155ec25e62815722e58296e1`	ole-package	OLE Ole10Native stream: MBD00356439/Ole10Native	439791 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.

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