buer | 3d994a2f80a63f31bf56ddded5ed35f020c40c0324b3ab1935e08b15c25ba017

General

Target

Review1.exe
Size

239KB
MD5

fa0322fb70610d6e67585588184eda39
SHA1

7bf793587550abbc8a39d5cb26b1328483b17820
SHA256

3d994a2f80a63f31bf56ddded5ed35f020c40c0324b3ab1935e08b15c25ba017
SHA512

6615bd7060022ab8e6e36160955f1e09d6800dbe509b85aafb738f890c54c1568cbbfbd77451a55bdefc42dd2c1ad899d78ef4022a8cdcfadcd2d1b3f0baa56b

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

C2

https://104.248.83.13/

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/424-0-0x00000000004C0000-0x00000000004CF000-memory.dmp	buer
behavioral2/memory/424-1-0x0000000040000000-0x000000004000C000-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)	\??\M:	Review1.exe
File opened (read-only)	\??\S:	Review1.exe
File opened (read-only)	\??\U:	Review1.exe
File opened (read-only)	\??\V:	Review1.exe
File opened (read-only)	\??\B:	Review1.exe
File opened (read-only)	\??\I:	Review1.exe
File opened (read-only)	\??\J:	Review1.exe
File opened (read-only)	\??\L:	Review1.exe
File opened (read-only)	\??\X:	Review1.exe
File opened (read-only)	\??\O:	Review1.exe
File opened (read-only)	\??\P:	Review1.exe
File opened (read-only)	\??\T:	Review1.exe
File opened (read-only)	\??\Z:	Review1.exe
File opened (read-only)	\??\N:	Review1.exe
File opened (read-only)	\??\R:	Review1.exe
File opened (read-only)	\??\W:	Review1.exe
File opened (read-only)	\??\Y:	Review1.exe
File opened (read-only)	\??\A:	Review1.exe
File opened (read-only)	\??\F:	Review1.exe
File opened (read-only)	\??\G:	Review1.exe
File opened (read-only)	\??\K:	Review1.exe
File opened (read-only)	\??\E:	Review1.exe
File opened (read-only)	\??\H:	Review1.exe
File opened (read-only)	\??\Q:	Review1.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
3792	powershell.exe
3792	powershell.exe
3792	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3792	powershell.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 424 wrote to memory of 3792	424	Review1.exe	77
PID 424 wrote to memory of 3792	424	Review1.exe	77
PID 424 wrote to memory of 3792	424	Review1.exe	77

C:\Users\Admin\AppData\Local\Temp\Review1.exe
"C:\Users\Admin\AppData\Local\Temp\Review1.exe"
1⤵
- Enumerates connected drives
- Suspicious use of WriteProcessMemory
PID:424
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\04ba0176ddf12cad9bea}"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3792

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:2840

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/424-0-0x00000000004C0000-0x00000000004CF000-memory.dmp

Filesize
60KB

Download
memory/424-1-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/3792-3-0x00000000736C0000-0x0000000073DAE000-memory.dmp

Filesize
6.9MB

Download
memory/3792-4-0x0000000004550000-0x0000000004551000-memory.dmp

Filesize
4KB

Download
memory/3792-5-0x0000000006EE0000-0x0000000006EE1000-memory.dmp

Filesize
4KB

Download
memory/3792-6-0x0000000006BA0000-0x0000000006BA1000-memory.dmp

Filesize
4KB

Download
memory/3792-7-0x0000000006D40000-0x0000000006D41000-memory.dmp

Filesize
4KB

Download
memory/3792-8-0x0000000007610000-0x0000000007611000-memory.dmp

Filesize
4KB

Download
memory/3792-9-0x0000000007680000-0x0000000007681000-memory.dmp

Filesize
4KB

Download
memory/3792-10-0x0000000006E10000-0x0000000006E11000-memory.dmp

Filesize
4KB

Download
memory/3792-11-0x0000000007DD0000-0x0000000007DD1000-memory.dmp

Filesize
4KB

Download
memory/3792-12-0x0000000007D10000-0x0000000007D11000-memory.dmp

Filesize
4KB

Download
memory/3792-14-0x0000000008AC0000-0x0000000008AF3000-memory.dmp

Filesize
204KB

Download
memory/3792-21-0x0000000008AA0000-0x0000000008AA1000-memory.dmp

Filesize
4KB

Download
memory/3792-22-0x0000000008E50000-0x0000000008E51000-memory.dmp

Filesize
4KB

Download
memory/3792-23-0x0000000009050000-0x0000000009051000-memory.dmp

Filesize
4KB

Download
memory/3792-24-0x0000000006900000-0x0000000006901000-memory.dmp

Filesize
4KB

Download
memory/3792-26-0x00000000068F0000-0x00000000068F1000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing