buer | e59e7db0c75cef4bb6e057d725bae7ed5e13fd011b54fe39c3fe7cdb123b684f

Analysis

max time kernel
171s
max time network
179s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
submitted
20-06-2022 13:51

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General

Target

7dd89cf8a1fd81909f2dd9b75cffa1f7ed98ae94c381a6c92ffd0a0dee7707d2.exe
Size

196KB
MD5

dd69fb6eb36fd0b9d0e14e099104726a
SHA1

6fb3cad9868b22a0563664d3c5cbefe7e57d09b2
SHA256

7dd89cf8a1fd81909f2dd9b75cffa1f7ed98ae94c381a6c92ffd0a0dee7707d2
SHA512

6743cac45032112bccf24bd0765f15727c7dd12a46e8162adc39c99631998f3b8b8544916ab398bbeaaa3704b65e8dd57b4f6dd8acaf1c933a2406e9525eacea

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

https://165.232.118.210/

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\\145d7a901eaee2143acd\\gennt.exe\""	gennt.exe

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral28/memory/4908-130-0x00000000006F0000-0x00000000006FF000-memory.dmp	buer
behavioral28/memory/4908-134-0x0000000040000000-0x000000004000C000-memory.dmp	buer
behavioral28/memory/4908-137-0x00000000006E0000-0x00000000006ED000-memory.dmp	buer
behavioral28/memory/4112-141-0x0000000002050000-0x000000000205F000-memory.dmp	buer

Executes dropped EXE 1 IoCs

pid	Process
4112	gennt.exe

Enumerates connected drives 3 TTPs 24 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\K:	gennt.exe
File opened (read-only)	\??\L:	gennt.exe
File opened (read-only)	\??\S:	gennt.exe
File opened (read-only)	\??\X:	gennt.exe
File opened (read-only)	\??\Y:	gennt.exe
File opened (read-only)	\??\A:	gennt.exe
File opened (read-only)	\??\B:	gennt.exe
File opened (read-only)	\??\M:	gennt.exe
File opened (read-only)	\??\P:	gennt.exe
File opened (read-only)	\??\T:	gennt.exe
File opened (read-only)	\??\U:	gennt.exe
File opened (read-only)	\??\F:	gennt.exe
File opened (read-only)	\??\I:	gennt.exe
File opened (read-only)	\??\J:	gennt.exe
File opened (read-only)	\??\O:	gennt.exe
File opened (read-only)	\??\W:	gennt.exe
File opened (read-only)	\??\E:	gennt.exe
File opened (read-only)	\??\G:	gennt.exe
File opened (read-only)	\??\Q:	gennt.exe
File opened (read-only)	\??\R:	gennt.exe
File opened (read-only)	\??\V:	gennt.exe
File opened (read-only)	\??\Z:	gennt.exe
File opened (read-only)	\??\H:	gennt.exe
File opened (read-only)	\??\N:	gennt.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2644	powershell.exe
2644	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2644	powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4908 wrote to memory of 4112	4908	7dd89cf8a1fd81909f2dd9b75cffa1f7ed98ae94c381a6c92ffd0a0dee7707d2.exe	91
PID 4908 wrote to memory of 4112	4908	7dd89cf8a1fd81909f2dd9b75cffa1f7ed98ae94c381a6c92ffd0a0dee7707d2.exe	91
PID 4908 wrote to memory of 4112	4908	7dd89cf8a1fd81909f2dd9b75cffa1f7ed98ae94c381a6c92ffd0a0dee7707d2.exe	91
PID 4112 wrote to memory of 2644	4112	gennt.exe	92
PID 4112 wrote to memory of 2644	4112	gennt.exe	92
PID 4112 wrote to memory of 2644	4112	gennt.exe	92

C:\Users\Admin\AppData\Local\Temp\7dd89cf8a1fd81909f2dd9b75cffa1f7ed98ae94c381a6c92ffd0a0dee7707d2.exe
"C:\Users\Admin\AppData\Local\Temp\7dd89cf8a1fd81909f2dd9b75cffa1f7ed98ae94c381a6c92ffd0a0dee7707d2.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4908
- C:\ProgramData\145d7a901eaee2143acd\gennt.exe
  C:\ProgramData\145d7a901eaee2143acd\gennt.exe "C:\Users\Admin\AppData\Local\Temp\7dd89cf8a1fd81909f2dd9b75cffa1f7ed98ae94c381a6c92ffd0a0dee7707d2.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Enumerates connected drives
  - Suspicious use of WriteProcessMemory
  PID:4112
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\145d7a901eaee2143acd}"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2644

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\145d7a901eaee2143acd\gennt.exe

Filesize
196KB

MD5
dd69fb6eb36fd0b9d0e14e099104726a

SHA1
6fb3cad9868b22a0563664d3c5cbefe7e57d09b2

SHA256
7dd89cf8a1fd81909f2dd9b75cffa1f7ed98ae94c381a6c92ffd0a0dee7707d2

SHA512
6743cac45032112bccf24bd0765f15727c7dd12a46e8162adc39c99631998f3b8b8544916ab398bbeaaa3704b65e8dd57b4f6dd8acaf1c933a2406e9525eacea

Download Submit
C:\ProgramData\145d7a901eaee2143acd\gennt.exe

Filesize
196KB

MD5
dd69fb6eb36fd0b9d0e14e099104726a

SHA1
6fb3cad9868b22a0563664d3c5cbefe7e57d09b2

SHA256
7dd89cf8a1fd81909f2dd9b75cffa1f7ed98ae94c381a6c92ffd0a0dee7707d2

SHA512
6743cac45032112bccf24bd0765f15727c7dd12a46e8162adc39c99631998f3b8b8544916ab398bbeaaa3704b65e8dd57b4f6dd8acaf1c933a2406e9525eacea

Download Submit
memory/2644-159-0x0000000007AC0000-0x0000000007ADA000-memory.dmp

Filesize
104KB

Download
memory/2644-152-0x0000000006060000-0x00000000060C6000-memory.dmp

Filesize
408KB

Download
memory/2644-154-0x00000000067B0000-0x00000000067CE000-memory.dmp

Filesize
120KB

Download
memory/2644-153-0x0000000006140000-0x00000000061A6000-memory.dmp

Filesize
408KB

Download
memory/2644-161-0x0000000007D40000-0x0000000007DD6000-memory.dmp

Filesize
600KB

Download
memory/2644-149-0x0000000003190000-0x00000000031C6000-memory.dmp

Filesize
216KB

Download
memory/2644-150-0x0000000005940000-0x0000000005F68000-memory.dmp

Filesize
6.2MB

Download
memory/2644-155-0x0000000007990000-0x00000000079C2000-memory.dmp

Filesize
200KB

Download
memory/2644-162-0x0000000007CF0000-0x0000000007CFE000-memory.dmp

Filesize
56KB

Download
memory/2644-164-0x0000000007DE0000-0x0000000007DE8000-memory.dmp

Filesize
32KB

Download
memory/2644-160-0x0000000007B30000-0x0000000007B3A000-memory.dmp

Filesize
40KB

Download
memory/2644-151-0x0000000005880000-0x00000000058A2000-memory.dmp

Filesize
136KB

Download
memory/2644-156-0x00000000703C0000-0x000000007040C000-memory.dmp

Filesize
304KB

Download
memory/2644-157-0x0000000006D60000-0x0000000006D7E000-memory.dmp

Filesize
120KB

Download
memory/2644-158-0x0000000008110000-0x000000000878A000-memory.dmp

Filesize
6.5MB

Download
memory/2644-163-0x0000000007E00000-0x0000000007E1A000-memory.dmp

Filesize
104KB

Download
memory/4112-141-0x0000000002050000-0x000000000205F000-memory.dmp

Filesize
60KB

Download
memory/4908-137-0x00000000006E0000-0x00000000006ED000-memory.dmp

Filesize
52KB

Download
memory/4908-130-0x00000000006F0000-0x00000000006FF000-memory.dmp

Filesize
60KB

Download
memory/4908-134-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download