Analysis

  • max time kernel
    65s
  • max time network
    139s
  • platform
    windows10_x64
  • resource
    win10v20210410
  • submitted
    22-07-2021 09:06

General

  • Target

    38911964dcd075508c459254ad27517d.exe

  • Size

    771KB

  • MD5

    38911964dcd075508c459254ad27517d

  • SHA1

    22c468c8d5efd3a5950ff1b28dbfa47b0a42f842

  • SHA256

    efd055ee7d3d09c7211dd6aceef64f42ff62d01edf0105d06d77d0b92411bedc

  • SHA512

    8e5cce82d2e222bf1fef8027533a17564041206d29611192cfe65c2a194a2bf8aa0be4d9414672a4361b43ec091d070267df6d806b932d96a9c2a6e292740971

Malware Config

Extracted

Family

vidar

Version

39.6

Botnet

517

C2

https://sslamlssa1.tumblr.com/

Attributes
  • profile_id

    517

Signatures

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Vidar Stealer 4 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 2 IoCs
  • Modifies file permissions 1 TTPs 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses 2FA software files, possible credential harvesting 2 TTPs
  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Looks up external IP address via web service 3 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of SetThreadContext 3 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Delays execution with timeout.exe 1 IoCs
  • Kills process with taskkill 1 IoCs
  • Modifies system certificate store 2 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 12 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 46 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\38911964dcd075508c459254ad27517d.exe
    "C:\Users\Admin\AppData\Local\Temp\38911964dcd075508c459254ad27517d.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:3540
    • C:\Users\Admin\AppData\Local\Temp\38911964dcd075508c459254ad27517d.exe
      "C:\Users\Admin\AppData\Local\Temp\38911964dcd075508c459254ad27517d.exe"
      2⤵
      • Adds Run key to start application
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2316
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\191de722-b52a-4231-94b4-561018b4a56e" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:3148
      • C:\Users\Admin\AppData\Local\Temp\38911964dcd075508c459254ad27517d.exe
        "C:\Users\Admin\AppData\Local\Temp\38911964dcd075508c459254ad27517d.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2968
        • C:\Users\Admin\AppData\Local\Temp\38911964dcd075508c459254ad27517d.exe
          "C:\Users\Admin\AppData\Local\Temp\38911964dcd075508c459254ad27517d.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:3508
          • C:\Users\Admin\AppData\Local\435fe941-4788-4f33-80dd-77d3a7768097\build2.exe
            "C:\Users\Admin\AppData\Local\435fe941-4788-4f33-80dd-77d3a7768097\build2.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:3172
            • C:\Users\Admin\AppData\Local\435fe941-4788-4f33-80dd-77d3a7768097\build2.exe
              "C:\Users\Admin\AppData\Local\435fe941-4788-4f33-80dd-77d3a7768097\build2.exe"
              6⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • Checks processor information in registry
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of WriteProcessMemory
              PID:1104
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\System32\cmd.exe" /c taskkill /im build2.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\435fe941-4788-4f33-80dd-77d3a7768097\build2.exe" & del C:\ProgramData\*.dll & exit
                7⤵
                • Suspicious use of WriteProcessMemory
                PID:3540
                • C:\Windows\SysWOW64\taskkill.exe
                  taskkill /im build2.exe /f
                  8⤵
                  • Kills process with taskkill
                  • Suspicious use of AdjustPrivilegeToken
                  PID:2248
                • C:\Windows\SysWOW64\timeout.exe
                  timeout /t 6
                  8⤵
                  • Delays execution with timeout.exe
                  PID:3524

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

File Permissions Modification

1
T1222

Modify Registry

2
T1112

Install Root Certificate

1
T1130

Credential Access

Credentials in Files

3
T1081

Discovery

Query Registry

2
T1012

System Information Discovery

2
T1082

Collection

Data from Local System

3
T1005

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\ProgramData\freebl3.dll
    MD5

    ef2834ac4ee7d6724f255beaf527e635

    SHA1

    5be8c1e73a21b49f353c2ecfa4108e43a883cb7b

    SHA256

    a770ecba3b08bbabd0a567fc978e50615f8b346709f8eb3cfacf3faab24090ba

    SHA512

    c6ea0e4347cbd7ef5e80ae8c0afdca20ea23ac2bdd963361dfaf562a9aed58dcbc43f89dd826692a064d76c3f4b3e92361af7b79a6d16a75d9951591ae3544d2

  • C:\ProgramData\mozglue.dll
    MD5

    8f73c08a9660691143661bf7332c3c27

    SHA1

    37fa65dd737c50fda710fdbde89e51374d0c204a

    SHA256

    3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

    SHA512

    0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

  • C:\ProgramData\msvcp140.dll
    MD5

    109f0f02fd37c84bfc7508d4227d7ed5

    SHA1

    ef7420141bb15ac334d3964082361a460bfdb975

    SHA256

    334e69ac9367f708ce601a6f490ff227d6c20636da5222f148b25831d22e13d4

    SHA512

    46eb62b65817365c249b48863d894b4669e20fcb3992e747cd5c9fdd57968e1b2cf7418d1c9340a89865eadda362b8db51947eb4427412eb83b35994f932fd39

  • C:\ProgramData\nss3.dll
    MD5

    bfac4e3c5908856ba17d41edcd455a51

    SHA1

    8eec7e888767aa9e4cca8ff246eb2aacb9170428

    SHA256

    e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

    SHA512

    2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

  • C:\ProgramData\softokn3.dll
    MD5

    a2ee53de9167bf0d6c019303b7ca84e5

    SHA1

    2a3c737fa1157e8483815e98b666408a18c0db42

    SHA256

    43536adef2ddcc811c28d35fa6ce3031029a2424ad393989db36169ff2995083

    SHA512

    45b56432244f86321fa88fbcca6a0d2a2f7f4e0648c1d7d7b1866adc9daa5eddd9f6bb73662149f279c9ab60930dad1113c8337cb5e6ec9eed5048322f65f7d8

  • C:\ProgramData\vcruntime140.dll
    MD5

    7587bf9cb4147022cd5681b015183046

    SHA1

    f2106306a8f6f0da5afb7fc765cfa0757ad5a628

    SHA256

    c40bb03199a2054dabfc7a8e01d6098e91de7193619effbd0f142a7bf031c14d

    SHA512

    0b63e4979846ceba1b1ed8470432ea6aa18cca66b5f5322d17b14bc0dfa4b2ee09ca300a016e16a01db5123e4e022820698f46d9bad1078bd24675b4b181e91f

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
    MD5

    12f9f4ed75c06441662a76909ee926fa

    SHA1

    e63cd517f59bad52bb18f6194bc16e35c801d66b

    SHA256

    a087b8dbd6fd00df49729b93bc2545e8b67b15df7fd01744adf7c7a70ec1c714

    SHA512

    e11879a36cd44500180ce7217771682723e2ebe4b16f2ba1f0610480db0e742f01f780feb7bc41c2d46413be4fa052dbc6b121bedb84ea4ea2005b9e3c044a12

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
    MD5

    aef6170147fedcea68415eb22f958d71

    SHA1

    3b7a51f810c9c18a557d3ab3cad0b90b8657d0ee

    SHA256

    bb2a64e07a2c7fa817c7d1674d4a4fa9d4ac75cadf600b3db895be4bbac041e9

    SHA512

    3f1f168fc71b0dc4d67329201962446452202cc22145f38c9c84895f4064a330212cebce4cbdd51588803b39e23e1a5a10bd88058a47556b55518894fc6e878f

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\07CEF2F654E3ED6050FFC9B6EB844250_3431D4C539FB2CFCB781821E9902850D
    MD5

    53be18b3282ce798dc7581ebca0fab5d

    SHA1

    744c5f3de2fad63873277bb4509e82c3ee64299e

    SHA256

    2189121feb829609b949d0b2bf15defa94bcb6830027917d2c0c5def0a017cbd

    SHA512

    c446cf51ace284692cb48b55e283dd2726ac4ca3d6fe6645184671029172bdf141e3731e658c59e6e07aeea242d68e437c84cfea553838b943a9d7cdb1daba6f

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B2FAF7692FD9FFBD64EDE317E42334BA_D7393C8F62BDE4D4CB606228BC7A711E
    MD5

    9a307bb1635db7eea24b3b40372d4e44

    SHA1

    d3a29d07e29f50b69c7e7ed22dc001aec5ca558e

    SHA256

    a8e8bee3fad9ad361b4236b7b8cbc9a79b6c2f1efe7f27b8bd7768518d19012a

    SHA512

    99d333d70a14a1b8ebf687a413a21f2480414938744913d629c98c2a878a1eb751a4b5f34819676222c7897b1a6d0edb6042938a4e9774f21eee2519b120e665

  • C:\Users\Admin\AppData\Local\191de722-b52a-4231-94b4-561018b4a56e\38911964dcd075508c459254ad27517d.exe
    MD5

    38911964dcd075508c459254ad27517d

    SHA1

    22c468c8d5efd3a5950ff1b28dbfa47b0a42f842

    SHA256

    efd055ee7d3d09c7211dd6aceef64f42ff62d01edf0105d06d77d0b92411bedc

    SHA512

    8e5cce82d2e222bf1fef8027533a17564041206d29611192cfe65c2a194a2bf8aa0be4d9414672a4361b43ec091d070267df6d806b932d96a9c2a6e292740971

  • C:\Users\Admin\AppData\Local\435fe941-4788-4f33-80dd-77d3a7768097\build2.exe
    MD5

    66bde9ddd0fb80ac7309176c23d03804

    SHA1

    45cd868973bac9c1808efdf19fd88dfd742cf7b4

    SHA256

    0a798e054fbe8545d4e1df781f3bb1a45b2fc58b5fb8d1c7383be8980aea829a

    SHA512

    65089ca60de87ee1557ac907bfac2f14d02ef55d3d687c9fb4b0628dcb35f32ae9507c1eebb435f079a0b3ca19ea635a77ebc3dbc24ffc8032d23e291cc36b03

  • C:\Users\Admin\AppData\Local\435fe941-4788-4f33-80dd-77d3a7768097\build2.exe
    MD5

    66bde9ddd0fb80ac7309176c23d03804

    SHA1

    45cd868973bac9c1808efdf19fd88dfd742cf7b4

    SHA256

    0a798e054fbe8545d4e1df781f3bb1a45b2fc58b5fb8d1c7383be8980aea829a

    SHA512

    65089ca60de87ee1557ac907bfac2f14d02ef55d3d687c9fb4b0628dcb35f32ae9507c1eebb435f079a0b3ca19ea635a77ebc3dbc24ffc8032d23e291cc36b03

  • C:\Users\Admin\AppData\Local\435fe941-4788-4f33-80dd-77d3a7768097\build2.exe
    MD5

    66bde9ddd0fb80ac7309176c23d03804

    SHA1

    45cd868973bac9c1808efdf19fd88dfd742cf7b4

    SHA256

    0a798e054fbe8545d4e1df781f3bb1a45b2fc58b5fb8d1c7383be8980aea829a

    SHA512

    65089ca60de87ee1557ac907bfac2f14d02ef55d3d687c9fb4b0628dcb35f32ae9507c1eebb435f079a0b3ca19ea635a77ebc3dbc24ffc8032d23e291cc36b03

  • \ProgramData\mozglue.dll
    MD5

    8f73c08a9660691143661bf7332c3c27

    SHA1

    37fa65dd737c50fda710fdbde89e51374d0c204a

    SHA256

    3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

    SHA512

    0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

  • \ProgramData\nss3.dll
    MD5

    bfac4e3c5908856ba17d41edcd455a51

    SHA1

    8eec7e888767aa9e4cca8ff246eb2aacb9170428

    SHA256

    e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

    SHA512

    2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

  • memory/1104-131-0x0000000000400000-0x00000000004A1000-memory.dmp
    Filesize

    644KB

  • memory/1104-135-0x0000000000400000-0x00000000004A1000-memory.dmp
    Filesize

    644KB

  • memory/1104-132-0x000000000046B76D-mapping.dmp
  • memory/2248-139-0x0000000000000000-mapping.dmp
  • memory/2316-114-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/2316-115-0x0000000000424141-mapping.dmp
  • memory/2316-119-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/2968-120-0x0000000000000000-mapping.dmp
  • memory/3148-116-0x0000000000000000-mapping.dmp
  • memory/3172-134-0x00000000026F0000-0x000000000278E000-memory.dmp
    Filesize

    632KB

  • memory/3172-128-0x0000000000000000-mapping.dmp
  • memory/3508-122-0x0000000000424141-mapping.dmp
  • memory/3508-127-0x0000000000400000-0x0000000000537000-memory.dmp
    Filesize

    1.2MB

  • memory/3524-140-0x0000000000000000-mapping.dmp
  • memory/3540-118-0x00000000049E0000-0x0000000004AFB000-memory.dmp
    Filesize

    1.1MB

  • memory/3540-138-0x0000000000000000-mapping.dmp