buer | a1bdc2ca2e359ac7d5c26afb3cd89bb39285b8a8acc5876e691ceb4ba807b704

Analysis

max time kernel
141s
max time network
118s
platform
windows7_x64
resource
win7
submitted
11-08-2020 15:48

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General

Target

Electronic_Tracking_INV_#9836582365728523752.exe
Size

245KB
MD5

64f86981c7450dfd2c3915f213fc6720
SHA1

5410d0e8569f0936b32de3199e8a187d6227fc1f
SHA256

a1bdc2ca2e359ac7d5c26afb3cd89bb39285b8a8acc5876e691ceb4ba807b704
SHA512

02e9e2e41a96a4e0279de44c5cdd7c18a4d08966e0e2ba9979d929f0fa5a902db1ceb3f2eb8a73d97725eed917f9e57d11999a0218f3f286908bf7e731931b22

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

https://specialhosting.ga/

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\1ff6f9cacff382d10a1a\\gennt.exe\""	gennt.exe

Buer Loader 6 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral1/memory/1124-0-0x0000000000100000-0x000000000010F000-memory.dmp	buer
behavioral1/memory/1172-1-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral1/memory/1172-2-0x000000004000303B-mapping.dmp	buer
behavioral1/memory/1172-4-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral1/memory/1380-8-0x00000000000D0000-0x00000000000DF000-memory.dmp	buer
behavioral1/memory/1820-10-0x000000004000303B-mapping.dmp	buer

Executes dropped EXE 2 IoCs

pid	Process
1380	gennt.exe
1820	gennt.exe

Deletes itself 1 IoCs

pid	Process
1820	gennt.exe

Loads dropped DLL 1 IoCs

pid	Process
1172	electronic_tracking_inv_#9836582365728523752.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1124 set thread context of 1172	1124	Electronic_Tracking_INV_#9836582365728523752.exe	24
PID 1380 set thread context of 1820	1380	gennt.exe	28

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1788	powershell.exe
1788	powershell.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
1124	Electronic_Tracking_INV_#9836582365728523752.exe
1380	gennt.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1788	powershell.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1124 wrote to memory of 1172	1124	Electronic_Tracking_INV_#9836582365728523752.exe	24
PID 1124 wrote to memory of 1172	1124	Electronic_Tracking_INV_#9836582365728523752.exe	24
PID 1124 wrote to memory of 1172	1124	Electronic_Tracking_INV_#9836582365728523752.exe	24
PID 1124 wrote to memory of 1172	1124	Electronic_Tracking_INV_#9836582365728523752.exe	24
PID 1124 wrote to memory of 1172	1124	Electronic_Tracking_INV_#9836582365728523752.exe	24
PID 1172 wrote to memory of 1380	1172	electronic_tracking_inv_#9836582365728523752.exe	27
PID 1172 wrote to memory of 1380	1172	electronic_tracking_inv_#9836582365728523752.exe	27
PID 1172 wrote to memory of 1380	1172	electronic_tracking_inv_#9836582365728523752.exe	27
PID 1172 wrote to memory of 1380	1172	electronic_tracking_inv_#9836582365728523752.exe	27
PID 1380 wrote to memory of 1820	1380	gennt.exe	28
PID 1380 wrote to memory of 1820	1380	gennt.exe	28
PID 1380 wrote to memory of 1820	1380	gennt.exe	28
PID 1380 wrote to memory of 1820	1380	gennt.exe	28
PID 1380 wrote to memory of 1820	1380	gennt.exe	28
PID 1820 wrote to memory of 1252	1820	gennt.exe	29
PID 1820 wrote to memory of 1252	1820	gennt.exe	29
PID 1820 wrote to memory of 1252	1820	gennt.exe	29
PID 1820 wrote to memory of 1252	1820	gennt.exe	29
PID 1820 wrote to memory of 1252	1820	gennt.exe	29
PID 1820 wrote to memory of 1252	1820	gennt.exe	29
PID 1820 wrote to memory of 1252	1820	gennt.exe	29
PID 1820 wrote to memory of 1252	1820	gennt.exe	29
PID 1820 wrote to memory of 1252	1820	gennt.exe	29
PID 1820 wrote to memory of 1252	1820	gennt.exe	29
PID 1820 wrote to memory of 1252	1820	gennt.exe	29
PID 1820 wrote to memory of 1252	1820	gennt.exe	29
PID 1820 wrote to memory of 1788	1820	gennt.exe	30
PID 1820 wrote to memory of 1788	1820	gennt.exe	30
PID 1820 wrote to memory of 1788	1820	gennt.exe	30
PID 1820 wrote to memory of 1788	1820	gennt.exe	30

C:\Users\Admin\AppData\Local\Temp\Electronic_Tracking_INV_#9836582365728523752.exe
"C:\Users\Admin\AppData\Local\Temp\Electronic_Tracking_INV_#9836582365728523752.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1124
- C:\Users\Admin\AppData\Local\Temp\electronic_tracking_inv_#9836582365728523752.exe
  "C:\Users\Admin\AppData\Local\Temp\Electronic_Tracking_INV_#9836582365728523752.exe"
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1172
- - C:\ProgramData\1ff6f9cacff382d10a1a\gennt.exe
    C:\ProgramData\1ff6f9cacff382d10a1a\gennt.exe "C:\Users\Admin\AppData\Local\Temp\electronic_tracking_inv_#9836582365728523752.exe" ensgJJ
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of WriteProcessMemory
    PID:1380
  - - C:\ProgramData\1ff6f9cacff382d10a1a\gennt.exe
      C:\ProgramData\1ff6f9cacff382d10a1a\gennt.exe "C:\Users\Admin\AppData\Local\Temp\electronic_tracking_inv_#9836582365728523752.exe" ensgJJ
      4⤵
      Modifies WinLogon for persistence
      Executes dropped EXE
      Deletes itself
      Suspicious use of WriteProcessMemory
      PID:1820
    - - C:\Windows\SysWOW64\secinit.exe
        
        C:\ProgramData\1ff6f9cacff382d10a1a\gennt.exe
        5⤵
        
        PID:1252
    - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        
        powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\1ff6f9cacff382d10a1a}"
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:1788

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1124-0-0x0000000000100000-0x000000000010F000-memory.dmp

Filesize
60KB

Download
memory/1172-1-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/1172-4-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/1380-8-0x00000000000D0000-0x00000000000DF000-memory.dmp

Filesize
60KB

Download
memory/1788-24-0x00000000056A0000-0x00000000056A1000-memory.dmp

Filesize
4KB

Download
memory/1788-17-0x0000000073BD0000-0x00000000742BE000-memory.dmp

Filesize
6.9MB

Download
memory/1788-18-0x0000000002330000-0x0000000002331000-memory.dmp

Filesize
4KB

Download
memory/1788-19-0x0000000004740000-0x0000000004741000-memory.dmp

Filesize
4KB

Download
memory/1788-20-0x0000000004FF0000-0x0000000004FF1000-memory.dmp

Filesize
4KB

Download
memory/1788-21-0x0000000005240000-0x0000000005241000-memory.dmp

Filesize
4KB

Download
memory/1788-53-0x0000000006310000-0x0000000006311000-memory.dmp

Filesize
4KB

Download
memory/1788-29-0x0000000006090000-0x0000000006091000-memory.dmp

Filesize
4KB

Download
memory/1788-30-0x0000000006210000-0x0000000006211000-memory.dmp

Filesize
4KB

Download
memory/1788-37-0x00000000061B0000-0x00000000061B1000-memory.dmp

Filesize
4KB

Download
memory/1788-38-0x0000000005610000-0x0000000005611000-memory.dmp

Filesize
4KB

Download
memory/1788-52-0x0000000006300000-0x0000000006301000-memory.dmp

Filesize
4KB

Download