buer | 28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30

General

Target

28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
Size

693KB
MD5

ffe12ba80351d8f6eaed89b3d91bb50f
SHA1

d6a1b915a7537535815a1e935cf8d8b30d5de82f
SHA256

28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30
SHA512

2427e2e946937049454485ecdad4d2f89e5772df0301100532f71dab4fe2ce1d34e10d8011f95842a92e5047ba632e825c074d882ec943722ed885fa676fca92

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

C2

https://greenwester.com/

Signatures

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

Buer Loader 2 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral1/memory/1124-0-0x0000000000520000-0x0000000000580000-memory.dmp	buer
behavioral1/memory/1124-1-0x0000000040000000-0x000000004005D000-memory.dmp	buer

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)	\??\U:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\V:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\W:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\X:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\Z:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\I:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\L:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\N:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\O:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\Q:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\T:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\Y:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\H:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\E:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\G:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\J:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\M:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\S:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\A:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\F:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\K:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\P:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\R:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
File opened (read-only)	\??\B:	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1516	powershell.exe
1516	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1516	powershell.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1124 wrote to memory of 1516	1124	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe	25
PID 1124 wrote to memory of 1516	1124	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe	25
PID 1124 wrote to memory of 1516	1124	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe	25
PID 1124 wrote to memory of 1516	1124	28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe	25

C:\Users\Admin\AppData\Local\Temp\28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe
"C:\Users\Admin\AppData\Local\Temp\28191a5a373b284f577aa1ac1c5895784fc2c274e46b448ab0cd5b9b22e33f30.exe"
1⤵
- Enumerates connected drives
- Suspicious use of WriteProcessMemory
PID:1124
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\ce28ded3dd3b6766f2cc}"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1516

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1124-0-0x0000000000520000-0x0000000000580000-memory.dmp

Filesize
384KB

Download
memory/1124-1-0x0000000040000000-0x000000004005D000-memory.dmp

Filesize
372KB

Download
memory/1516-3-0x0000000073910000-0x0000000073FFE000-memory.dmp

Filesize
6.9MB

Download
memory/1516-4-0x0000000000F70000-0x0000000000F71000-memory.dmp

Filesize
4KB

Download
memory/1516-5-0x0000000004720000-0x0000000004721000-memory.dmp

Filesize
4KB

Download
memory/1516-6-0x0000000001050000-0x0000000001051000-memory.dmp

Filesize
4KB

Download
memory/1516-7-0x0000000005240000-0x0000000005241000-memory.dmp

Filesize
4KB

Download
memory/1516-10-0x0000000006060000-0x0000000006061000-memory.dmp

Filesize
4KB

Download
memory/1516-15-0x00000000060C0000-0x00000000060C1000-memory.dmp

Filesize
4KB

Download
memory/1516-16-0x0000000006120000-0x0000000006121000-memory.dmp

Filesize
4KB

Download
memory/1516-23-0x0000000006280000-0x0000000006281000-memory.dmp

Filesize
4KB

Download
memory/1516-24-0x0000000005FF0000-0x0000000005FF1000-memory.dmp

Filesize
4KB

Download
memory/1516-38-0x0000000006300000-0x0000000006301000-memory.dmp

Filesize
4KB

Download
memory/1516-39-0x0000000006310000-0x0000000006311000-memory.dmp

Filesize
4KB

Download

Analysis

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