Analysis

  • max time kernel
    151s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    13-06-2022 12:51

General

  • Target

    TRN-97366461563688738_CIF_00077637283651296368_doc.exe

  • Size

    538KB

  • MD5

    71c04c5d339db01981ea6896784ab4af

  • SHA1

    c9a8e3ad849f7e146e8d33008df1eba0a367aa96

  • SHA256

    b884f8567f4e5056c3d4b58869a277830c40658f89ec5fa1e696c2e78620d9a0

  • SHA512

    b4c1425f40757da86175a9c4f4462619ce4118ccc6e81eedd6218091ec666a60e15dfd434f7e1330993ca0b722c3e7346e8f845901eb55de2680e74637a42209

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

172.94.127.61:5888

Attributes
  • audio_folder

    MicRecords

  • audio_path

    %AppData%

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    remcos.exe

  • copy_folder

    Remcos

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    false

  • install_path

    %AppData%

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • keylog_path

    %AppData%

  • mouse_option

    false

  • mutex

    Remcos-V4JCDL

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    Remcos

  • take_screenshot_option

    false

  • take_screenshot_time

    5

  • take_screenshot_title

Signatures

  • Modifies system executable filetype association 2 TTPs 1 IoCs
  • Neshta

    Malware from the neshta family is designed to infect itself into other files to spread itself and cause damage.

  • Remcos

    Remcos is a closed-source remote control and surveillance software.

  • Executes dropped EXE 3 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 1 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • NSIS installer 2 IoCs
  • Modifies registry class 1 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of WriteProcessMemory 18 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\TRN-97366461563688738_CIF_00077637283651296368_doc.exe
    "C:\Users\Admin\AppData\Local\Temp\TRN-97366461563688738_CIF_00077637283651296368_doc.exe"
    1⤵
    • Modifies system executable filetype association
    • Checks computer location settings
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:3004
    • C:\Users\Admin\AppData\Local\Temp\3582-490\TRN-97366461563688738_CIF_00077637283651296368_doc.exe
      "C:\Users\Admin\AppData\Local\Temp\3582-490\TRN-97366461563688738_CIF_00077637283651296368_doc.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of WriteProcessMemory
      PID:2092
      • C:\Users\Admin\AppData\Local\Temp\uzcfwhcy.exe
        C:\Users\Admin\AppData\Local\Temp\uzcfwhcy.exe C:\Users\Admin\AppData\Local\Temp\rjiaygkayi
        3⤵
        • Executes dropped EXE
        • Adds Run key to start application
        • Suspicious use of WriteProcessMemory
        PID:3804
        • C:\Users\Admin\AppData\Local\Temp\uzcfwhcy.exe
          C:\Users\Admin\AppData\Local\Temp\uzcfwhcy.exe C:\Users\Admin\AppData\Local\Temp\rjiaygkayi
          4⤵
          • Executes dropped EXE
          • Suspicious behavior: GetForegroundWindowSpam
          PID:4932

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Change Default File Association

1
T1042

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

2
T1112

Credential Access

Credentials in Files

1
T1081

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

Collection

Data from Local System

1
T1005

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\3582-490\TRN-97366461563688738_CIF_00077637283651296368_doc.exe
    Filesize

    498KB

    MD5

    5402342edb79f8ce8ce5cf77658710dd

    SHA1

    234ae4176f742615633f9f2334c61d62ed955d7a

    SHA256

    e54c822ca727d7988d741770e00a763b8ac2984bc1794a88f3c7f999ea86a8cd

    SHA512

    654b282cd7e8acfac67d4c799e5e6fac1592f9070e8673a6270f5f132e7bf24c376993ce07864bf0d691a160309dc1d324418c76b993749c16a479b299a046e9

  • C:\Users\Admin\AppData\Local\Temp\3582-490\TRN-97366461563688738_CIF_00077637283651296368_doc.exe
    Filesize

    498KB

    MD5

    5402342edb79f8ce8ce5cf77658710dd

    SHA1

    234ae4176f742615633f9f2334c61d62ed955d7a

    SHA256

    e54c822ca727d7988d741770e00a763b8ac2984bc1794a88f3c7f999ea86a8cd

    SHA512

    654b282cd7e8acfac67d4c799e5e6fac1592f9070e8673a6270f5f132e7bf24c376993ce07864bf0d691a160309dc1d324418c76b993749c16a479b299a046e9

  • C:\Users\Admin\AppData\Local\Temp\rjiaygkayi
    Filesize

    6KB

    MD5

    26ad7648655c539e77a0945bb0a2d194

    SHA1

    2df236e98bf7f4d325f8a7731d00bcc70de57cc8

    SHA256

    33cfca43581c7a7327781e632108291283597814d28b2acf8e987ea7bb28509e

    SHA512

    61e0244149bdcf688e4b9577dd90c11c435a1b8ca5fed759ef354d5791fb05dda892349f38c310af35d2c827b64238fb2d535b71256d6adb9aac2f6bc5bd4d75

  • C:\Users\Admin\AppData\Local\Temp\uzcfwhcy.exe
    Filesize

    6KB

    MD5

    7bcee9a725d43e08cbc68a87f4407be5

    SHA1

    8c68ca49ec4916e19e43d71136ccf2e0e7419b7f

    SHA256

    c176716369ca34704c2599654abb00f9ee3ce3b471978316b23e3782f13402e4

    SHA512

    b9c8107e404194f1ed98e48d75cf34d69f4fac5a30609157e2550bcabf7c0cba455d8b4c0f7535f649e4bcc219ade11c0940f835a8d4bfeb2e6f2b96f08e6a94

  • C:\Users\Admin\AppData\Local\Temp\uzcfwhcy.exe
    Filesize

    6KB

    MD5

    7bcee9a725d43e08cbc68a87f4407be5

    SHA1

    8c68ca49ec4916e19e43d71136ccf2e0e7419b7f

    SHA256

    c176716369ca34704c2599654abb00f9ee3ce3b471978316b23e3782f13402e4

    SHA512

    b9c8107e404194f1ed98e48d75cf34d69f4fac5a30609157e2550bcabf7c0cba455d8b4c0f7535f649e4bcc219ade11c0940f835a8d4bfeb2e6f2b96f08e6a94

  • C:\Users\Admin\AppData\Local\Temp\uzcfwhcy.exe
    Filesize

    6KB

    MD5

    7bcee9a725d43e08cbc68a87f4407be5

    SHA1

    8c68ca49ec4916e19e43d71136ccf2e0e7419b7f

    SHA256

    c176716369ca34704c2599654abb00f9ee3ce3b471978316b23e3782f13402e4

    SHA512

    b9c8107e404194f1ed98e48d75cf34d69f4fac5a30609157e2550bcabf7c0cba455d8b4c0f7535f649e4bcc219ade11c0940f835a8d4bfeb2e6f2b96f08e6a94

  • C:\Users\Admin\AppData\Local\Temp\y2aqvixietuh6xwtq8u
    Filesize

    463KB

    MD5

    ea1f0dd2857b84a5ab5bcdcb159a023e

    SHA1

    d61eafa75f677e8d821a5bbad6314ff0d7990ead

    SHA256

    36ece4629965196d897edd441778ceb5ff1f6c90af9e34b878aebb531d6fb5e1

    SHA512

    095b8ed8ef124c3ca50548d4a33ecca7a5196d4f79d1b0aa3c85a10a4f370cae1f06c560e50a2aed89728cb82fed7a9e99943b427abfbbac8dd922059c9ff3e0

  • memory/2092-130-0x0000000000000000-mapping.dmp
  • memory/3804-133-0x0000000000000000-mapping.dmp
  • memory/4932-138-0x0000000000000000-mapping.dmp
  • memory/4932-140-0x0000000000160000-0x00000000001DB000-memory.dmp
    Filesize

    492KB

  • memory/4932-145-0x0000000000160000-0x00000000001DB000-memory.dmp
    Filesize

    492KB

  • memory/4932-150-0x0000000000160000-0x00000000001DB000-memory.dmp
    Filesize

    492KB