Office (OLE) / .XLS malware analysis — malicious · 97b7d12c4a348d96

MALICIOUS

Office (OLE) / .XLS

44.0 KB Created: 2022-04-18 09:37:27 Authoring application: Microsoft Excel First seen: 2022-04-29

MD5: 736447d268ff1c0d5d10b732b5661989 SHA-1: 422d4fc9b3ef36497007183e6d429df8b869524c SHA-256: 97b7d12c4a348d966358ac4e7df14627fd327ec6aaee994a9100e83331f412be

308 Risk Score

Malware Insights

MITRE ATT&CK

T1059.003 Windows Command Shell T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The Workbook_Open macro is configured to execute cmd.exe with elevated privileges using the 'runas' verb. It also constructs and writes an 'ipconfig.vbs' file to the temporary directory. The script attempts to establish persistence by writing to the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy. The obfuscated string '67794C4672496C7679744A6A50776B58527A4A774A5753694B454D6B4C76446C68777A49614E4C5049746A7267754965425A455142576B6B4644554E56614B6351786374574258654E544E704D42627157494A4C524E4B6B6C706378535955494A684149726F685A63416348695578654245516D72596C644E52684879416C505A66464661745949424B49714B6363725259566F6948724B56785641674141436F6E49636F53646947694C477156734C50515041455847734F564A44797842626A676278755A63' is likely a payload or configuration data. The overall intent appears to be downloading and executing a second-stage payload.

Heuristics 9

Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
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
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
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
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` `1af17490d211cc640924ac63969a29c6d2101bb29dbefa2c52010474bfce2b1c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4467 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 4 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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