Analysis

  • max time kernel
    151s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    21/06/2022, 10:20

General

  • Target

    bis.exe

  • Size

    451KB

  • MD5

    9e1bb80ff1f6f5181ed26c62ef3de29d

  • SHA1

    5c37096275b5947dfd68ccacc92eec204fa73883

  • SHA256

    a92f8917b2e98217ede5359f7906dd0a60df26e087a1e1c33b81797a334fb448

  • SHA512

    f1493090882bbe106508b50a0dcc8ac9966b157837f3d3d428b5b1977bcda3ea00eb067b5f925add5a38e069cfb4e7ce63be49ba8db29b23eb171290226e7004

Malware Config

Extracted

Family

xloader

Version

2.9

Campaign

rb1k

Decoy

Hy3kKk3exSb8BwggZ6MfKxQ=

NCL+/Dy1jhSUG9mRm0U=

wWOomCbzt4pHcH22F16ZDMRcKw==

WTIg8VQo+NeSJsTaLk6M9XQi

GxTnP34PxKGMqI0aDg==

BCLmUMWYgpQ0hmDGRvcILQM=

ILk0ukAA71UFWNrW

aHq3rPmIgJpVF+C9GQ==

8jYg+GYnGycf+ufa9Fo=

gQpOLax1ZUbL5at4u1SkP/XMaS0=

s1abd4QIyia5Ta6zEUSM9XQi

JDL1dr1IE+a1q4zB

24b2gBbkpvG81Nh1rLjxJw==

U5KEePzSsY5a/WYuVdUXnycmbPcnk6RB

D+TYrgrRwtaL5YIUEQ==

T1gpjLMr70QZODL8/UOM9XQi

f3Efb+StKpP+MQ==

fUfDKVLlzfcCFgo=

23rI2NitbuCL

ypQDXuCwKpP+MQ==

Signatures

  • Xloader

    Xloader is a rebranded version of Formbook malware.

  • suricata: ET MALWARE FormBook CnC Checkin (GET)

    suricata: ET MALWARE FormBook CnC Checkin (GET)

  • suricata: ET MALWARE FormBook CnC Checkin (POST) M2

    suricata: ET MALWARE FormBook CnC Checkin (POST) M2

  • Xloader Payload 4 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Adds Run key to start application 2 TTPs 2 IoCs
  • Suspicious use of SetThreadContext 3 IoCs
  • Drops file in Program Files directory 1 IoCs
  • Modifies Internet Explorer settings 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 36 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 21 IoCs

Processes

  • C:\Windows\Explorer.EXE
    C:\Windows\Explorer.EXE
    1⤵
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of WriteProcessMemory
    PID:2044
    • C:\Users\Admin\AppData\Local\Temp\bis.exe
      "C:\Users\Admin\AppData\Local\Temp\bis.exe"
      2⤵
      • Suspicious use of SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:2276
      • C:\Users\Admin\AppData\Local\Temp\bis.exe
        "C:\Users\Admin\AppData\Local\Temp\bis.exe"
        3⤵
        • Checks computer location settings
        • Suspicious use of SetThreadContext
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: MapViewOfSection
        • Suspicious use of AdjustPrivilegeToken
        PID:2544
    • C:\Windows\SysWOW64\mstsc.exe
      "C:\Windows\SysWOW64\mstsc.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious use of SetThreadContext
      • Drops file in Program Files directory
      • Modifies Internet Explorer settings
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: MapViewOfSection
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2328
      • C:\Windows\SysWOW64\cmd.exe
        /c del "C:\Users\Admin\AppData\Local\Temp\bis.exe"
        3⤵
          PID:4232
        • C:\Windows\SysWOW64\cmd.exe
          /c copy "C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Login Data" "C:\Users\Admin\AppData\Local\Temp\DB1" /V
          3⤵
            PID:1264
          • C:\Windows\SysWOW64\cmd.exe
            /c copy "C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Login Data" "C:\Users\Admin\AppData\Local\Temp\DB1" /V
            3⤵
              PID:3052
            • C:\Program Files\Mozilla Firefox\Firefox.exe
              "C:\Program Files\Mozilla Firefox\Firefox.exe"
              3⤵
                PID:1900

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                • C:\Users\Admin\AppData\Local\Temp\DB1

                  Filesize

                  40KB

                  MD5

                  b608d407fc15adea97c26936bc6f03f6

                  SHA1

                  953e7420801c76393902c0d6bb56148947e41571

                  SHA256

                  b281ce54125d4250a80f48fcc02a8eea53f2c35c3b726e2512c3d493da0013bf

                  SHA512

                  cc96ddf4bf90d6aaa9d86803cb2aa30cd8e9b295aee1bd5544b88aeab63dc60bb1d4641e846c9771bab51aabbfbcd984c6d3ee83b96f5b65d09c0841d464b9e4

                • C:\Users\Admin\AppData\Local\Temp\DB1

                  Filesize

                  48KB

                  MD5

                  349e6eb110e34a08924d92f6b334801d

                  SHA1

                  bdfb289daff51890cc71697b6322aa4b35ec9169

                  SHA256

                  c9fd7be4579e4aa942e8c2b44ab10115fa6c2fe6afd0c584865413d9d53f3b2a

                  SHA512

                  2a635b815a5e117ea181ee79305ee1baf591459427acc5210d8c6c7e447be3513ead871c605eb3d32e4ab4111b2a335f26520d0ef8c1245a4af44e1faec44574

                • memory/2044-141-0x0000000008AE0000-0x0000000008BD1000-memory.dmp

                  Filesize

                  964KB

                • memory/2044-150-0x0000000008BE0000-0x0000000008CF8000-memory.dmp

                  Filesize

                  1.1MB

                • memory/2044-148-0x0000000008BE0000-0x0000000008CF8000-memory.dmp

                  Filesize

                  1.1MB

                • memory/2276-134-0x00000000088F0000-0x000000000898C000-memory.dmp

                  Filesize

                  624KB

                • memory/2276-130-0x00000000002B0000-0x0000000000328000-memory.dmp

                  Filesize

                  480KB

                • memory/2276-133-0x0000000004D70000-0x0000000004D7A000-memory.dmp

                  Filesize

                  40KB

                • memory/2276-132-0x0000000004CD0000-0x0000000004D62000-memory.dmp

                  Filesize

                  584KB

                • memory/2276-131-0x00000000051E0000-0x0000000005784000-memory.dmp

                  Filesize

                  5.6MB

                • memory/2328-149-0x0000000000E50000-0x0000000000E7C000-memory.dmp

                  Filesize

                  176KB

                • memory/2328-144-0x0000000000680000-0x00000000007BA000-memory.dmp

                  Filesize

                  1.2MB

                • memory/2328-145-0x0000000000E50000-0x0000000000E7C000-memory.dmp

                  Filesize

                  176KB

                • memory/2328-146-0x0000000002D60000-0x00000000030AA000-memory.dmp

                  Filesize

                  3.3MB

                • memory/2328-147-0x0000000002BF0000-0x0000000002C80000-memory.dmp

                  Filesize

                  576KB

                • memory/2544-136-0x0000000000400000-0x000000000042C000-memory.dmp

                  Filesize

                  176KB

                • memory/2544-140-0x0000000001720000-0x0000000001731000-memory.dmp

                  Filesize

                  68KB

                • memory/2544-139-0x0000000001760000-0x0000000001AAA000-memory.dmp

                  Filesize

                  3.3MB

                • memory/2544-138-0x0000000000400000-0x000000000042C000-memory.dmp

                  Filesize

                  176KB