buer | 67c08d2a21a3ade47ed790aa65ef7cbb117e32300b432f5be97d5ff13c745247

General

Target

Print_Document.exe
Size

239KB
MD5

f447d7a2f7cfb24db6b3c42716b16457
SHA1

6c898d8bc1b2311859b34df36e0ba9c392a30b9f
SHA256

67c08d2a21a3ade47ed790aa65ef7cbb117e32300b432f5be97d5ff13c745247
SHA512

b303f0d106ce5fadda89346e78516ca8251dd532f1efa2540085b665d9de6dbba03c77bdc7007294a893f62a5e1fe22790513b97261eb6ba4eed1aac4d870e1a

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/3820-0-0x0000000000610000-0x000000000061F000-memory.dmp	buer
behavioral2/memory/3820-1-0x0000000040000000-0x000000004000C000-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)	\??\L:	Print_Document.exe
File opened (read-only)	\??\S:	Print_Document.exe
File opened (read-only)	\??\U:	Print_Document.exe
File opened (read-only)	\??\V:	Print_Document.exe
File opened (read-only)	\??\Z:	Print_Document.exe
File opened (read-only)	\??\F:	Print_Document.exe
File opened (read-only)	\??\G:	Print_Document.exe
File opened (read-only)	\??\J:	Print_Document.exe
File opened (read-only)	\??\Q:	Print_Document.exe
File opened (read-only)	\??\B:	Print_Document.exe
File opened (read-only)	\??\I:	Print_Document.exe
File opened (read-only)	\??\M:	Print_Document.exe
File opened (read-only)	\??\O:	Print_Document.exe
File opened (read-only)	\??\P:	Print_Document.exe
File opened (read-only)	\??\T:	Print_Document.exe
File opened (read-only)	\??\Y:	Print_Document.exe
File opened (read-only)	\??\A:	Print_Document.exe
File opened (read-only)	\??\E:	Print_Document.exe
File opened (read-only)	\??\N:	Print_Document.exe
File opened (read-only)	\??\W:	Print_Document.exe
File opened (read-only)	\??\X:	Print_Document.exe
File opened (read-only)	\??\H:	Print_Document.exe
File opened (read-only)	\??\K:	Print_Document.exe
File opened (read-only)	\??\R:	Print_Document.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1956	powershell.exe
1956	powershell.exe
1956	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1956	powershell.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 3820 wrote to memory of 1956	3820	Print_Document.exe	76
PID 3820 wrote to memory of 1956	3820	Print_Document.exe	76
PID 3820 wrote to memory of 1956	3820	Print_Document.exe	76

C:\Users\Admin\AppData\Local\Temp\Print_Document.exe
"C:\Users\Admin\AppData\Local\Temp\Print_Document.exe"
1⤵
- Enumerates connected drives
- Suspicious use of WriteProcessMemory
PID:3820
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\fd8fd7c8e06052eddca4}"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1956

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/1956-8-0x0000000006C10000-0x0000000006C11000-memory.dmp

Filesize
4KB

Download
memory/1956-26-0x0000000008DD0000-0x0000000008DD1000-memory.dmp

Filesize
4KB

Download
memory/1956-9-0x0000000007500000-0x0000000007501000-memory.dmp

Filesize
4KB

Download
memory/1956-3-0x0000000073800000-0x0000000073EEE000-memory.dmp

Filesize
6.9MB

Download
memory/1956-4-0x0000000004130000-0x0000000004131000-memory.dmp

Filesize
4KB

Download
memory/1956-5-0x0000000006DD0000-0x0000000006DD1000-memory.dmp

Filesize
4KB

Download
memory/1956-6-0x0000000006A00000-0x0000000006A01000-memory.dmp

Filesize
4KB

Download
memory/1956-7-0x0000000006BA0000-0x0000000006BA1000-memory.dmp

Filesize
4KB

Download
memory/1956-24-0x0000000008E00000-0x0000000008E01000-memory.dmp

Filesize
4KB

Download
memory/1956-11-0x0000000007CE0000-0x0000000007CE1000-memory.dmp

Filesize
4KB

Download
memory/1956-10-0x0000000006CE0000-0x0000000006CE1000-memory.dmp

Filesize
4KB

Download
memory/1956-12-0x0000000007B80000-0x0000000007B81000-memory.dmp

Filesize
4KB

Download
memory/1956-14-0x0000000008B30000-0x0000000008B63000-memory.dmp

Filesize
204KB

Download
memory/1956-21-0x00000000088F0000-0x00000000088F1000-memory.dmp

Filesize
4KB

Download
memory/1956-22-0x0000000008C70000-0x0000000008C71000-memory.dmp

Filesize
4KB

Download
memory/1956-23-0x0000000008EA0000-0x0000000008EA1000-memory.dmp

Filesize
4KB

Download
memory/3820-1-0x0000000040000000-0x000000004000C000-memory.dmp

Filesize
48KB

Download
memory/3820-0-0x0000000000610000-0x000000000061F000-memory.dmp

Filesize
60KB

Download

Analysis

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