Office (OLE) malware analysis — malicious · 39647d1829fcc16d

MALICIOUS

Office (OLE)

387.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: ddfe01c006b3cbf4a6929073e235a8b4 SHA-1: 59b4c1ec4cb1428b812726c00a29aee9138d46b2 SHA-256: 39647d1829fcc16d1e20e0b6ccb582b85ff0a37f8530395628c44eda88542ed3

468 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer T1059.001 PowerShell

The Workbook_Open VBA macro is configured to execute a DLL named 'omsh.dll' from the user's temporary directory using 'rundll32'. This macro also contains logic to copy a shape and potentially call a function 'nam' which appears to rename a file. The presence of an embedded PE executable and the use of ShellExecute and LoadLibrary APIs strongly suggest this Excel file is a dropper for a malicious payload. The macro's intent is to download and execute a second-stage payload, likely the embedded PE file or a file dropped by it.

Heuristics 14

Embedded PE executable critical OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
Reference to LoadLibrary API high SC_STR_LOADLIBRARY

Reference to LoadLibrary API
Reference to GetProcAddress API high SC_STR_GETPROCADDRESS

Reference to GetProcAddress API
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
Ole10Native package carries executable/script file type high OFFICE_PACKAGE_RISKY_FILE

OLE Package displayName or fullPath ends in an executable or script-capable extension. Even without UI extension spoofing, embedding a runnable payload inside an Office document is a high-risk delivery pattern.
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.
Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE

Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
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.
NOP-equivalent sled detected medium SC_NOP_EQUIV_SLED

Long run of 0x40 bytes
Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc API
Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECT

Reference to VirtualProtect API
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `f6a9321bedda12fa27028642ecb1f63e72ae2e67b37cfe1f79707ddb8300f400`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2199 bytes
`embedded_office_00001275.exe` `1d0e0e70d1f7b4cd6aa4df3c54797496dd031040cbafa1b8f7feb1886a872c0b`	embedded-pe	Office MZ+PE at offset 0x1275	392075 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` `049c705fc436edf8ada23a5742797ff11e7845f6c0ad0de21a0c12ffe35ae9ae`	ole-package	OLE Ole10Native stream: MBD000306D0/Ole10Native	250177 bytes

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