buer | 4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d

General

Target

4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
Size

693KB
MD5

b61b330f0ad589422d862cebf65e92c1
SHA1

54d7cb2745607e2ea52db8423cf9f210c7674ee6
SHA256

4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d
SHA512

534bc27db1c8df0ff2c7e5aaf4dc6a4aaffde931e3dacb2490b219c3a0323362afdec5d65d18d6c1ba44cbd384a1020319ff3298ab1330cab459b8b198d46dc1

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

C2

https://bankcreditsign.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
behavioral2/memory/788-0-0x0000000002550000-0x00000000025B0000-memory.dmp	buer
behavioral2/memory/788-1-0x0000000040000000-0x000000004005D000-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)	\??\X:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\Y:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\O:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\R:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\T:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\L:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\N:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\V:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\W:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\B:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\E:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\I:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\J:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\P:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\Z:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\A:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\F:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\G:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\Q:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\S:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\U:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\H:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\K:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
File opened (read-only)	\??\M:	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
3596	powershell.exe
3596	powershell.exe
3596	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3596	powershell.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 788 wrote to memory of 3596	788	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe	73
PID 788 wrote to memory of 3596	788	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe	73
PID 788 wrote to memory of 3596	788	4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe	73

C:\Users\Admin\AppData\Local\Temp\4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe
"C:\Users\Admin\AppData\Local\Temp\4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d.exe"
1⤵
- Enumerates connected drives
- Suspicious use of WriteProcessMemory
PID:788
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\2ddb0287d95da9fd3e75}"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3596

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

Loading Replay Monitor...

Downloads

memory/788-0-0x0000000002550000-0x00000000025B0000-memory.dmp

Filesize
384KB

Download
memory/788-1-0x0000000040000000-0x000000004005D000-memory.dmp

Filesize
372KB

Download
memory/3596-3-0x0000000073180000-0x000000007386E000-memory.dmp

Filesize
6.9MB

Download
memory/3596-4-0x0000000007040000-0x0000000007041000-memory.dmp

Filesize
4KB

Download
memory/3596-5-0x00000000077A0000-0x00000000077A1000-memory.dmp

Filesize
4KB

Download
memory/3596-6-0x0000000007720000-0x0000000007721000-memory.dmp

Filesize
4KB

Download
memory/3596-7-0x0000000007E40000-0x0000000007E41000-memory.dmp

Filesize
4KB

Download
memory/3596-8-0x0000000007EB0000-0x0000000007EB1000-memory.dmp

Filesize
4KB

Download
memory/3596-9-0x0000000008090000-0x0000000008091000-memory.dmp

Filesize
4KB

Download
memory/3596-10-0x0000000007F60000-0x0000000007F61000-memory.dmp

Filesize
4KB

Download
memory/3596-11-0x0000000008520000-0x0000000008521000-memory.dmp

Filesize
4KB

Download
memory/3596-12-0x0000000008780000-0x0000000008781000-memory.dmp

Filesize
4KB

Download
memory/3596-14-0x0000000009770000-0x00000000097A3000-memory.dmp

Filesize
204KB

Download
memory/3596-21-0x0000000009750000-0x0000000009751000-memory.dmp

Filesize
4KB

Download
memory/3596-22-0x00000000098C0000-0x00000000098C1000-memory.dmp

Filesize
4KB

Download
memory/3596-23-0x0000000009B00000-0x0000000009B01000-memory.dmp

Filesize
4KB

Download
memory/3596-24-0x0000000009A60000-0x0000000009A61000-memory.dmp

Filesize
4KB

Download
memory/3596-26-0x0000000007390000-0x0000000007391000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing