buer | 6b665a866997d39ba17c6b687693c71b4d4a622d016ad7e0c37bc735524858be

General

Target

AnnualReport.exe
Size

3.1MB
MD5

7908cc9996b7423c766157d8119df254
SHA1

7974b277a69b8c811734a6ad30f3ad1f523d3503
SHA256

6b665a866997d39ba17c6b687693c71b4d4a622d016ad7e0c37bc735524858be
SHA512

8fc36eeef99a7e3df702672bc0f19077324cda0a17af0c75818d9f11c44c7c51d2d8b51290775ef22aedfb809a1b718a9593cf4777334d8b44d37a75e07c5554

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

C2

https://itofficemasword.com/

Signatures

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

Buer Loader 4 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral1/memory/1304-61-0x0000000000390000-0x00000000003F0000-memory.dmp	buer
behavioral1/memory/1304-64-0x0000000040000000-0x000000004005E000-memory.dmp	buer
behavioral1/memory/1304-68-0x00000000002A0000-0x00000000002FD000-memory.dmp	buer
behavioral1/memory/1540-71-0x0000000002600000-0x000000000324A000-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)	\??\J:	AnnualReport.exe
File opened (read-only)	\??\M:	AnnualReport.exe
File opened (read-only)	\??\N:	AnnualReport.exe
File opened (read-only)	\??\Q:	AnnualReport.exe
File opened (read-only)	\??\R:	AnnualReport.exe
File opened (read-only)	\??\T:	AnnualReport.exe
File opened (read-only)	\??\B:	AnnualReport.exe
File opened (read-only)	\??\H:	AnnualReport.exe
File opened (read-only)	\??\V:	AnnualReport.exe
File opened (read-only)	\??\Y:	AnnualReport.exe
File opened (read-only)	\??\K:	AnnualReport.exe
File opened (read-only)	\??\W:	AnnualReport.exe
File opened (read-only)	\??\S:	AnnualReport.exe
File opened (read-only)	\??\U:	AnnualReport.exe
File opened (read-only)	\??\Z:	AnnualReport.exe
File opened (read-only)	\??\E:	AnnualReport.exe
File opened (read-only)	\??\G:	AnnualReport.exe
File opened (read-only)	\??\I:	AnnualReport.exe
File opened (read-only)	\??\L:	AnnualReport.exe
File opened (read-only)	\??\O:	AnnualReport.exe
File opened (read-only)	\??\P:	AnnualReport.exe
File opened (read-only)	\??\X:	AnnualReport.exe
File opened (read-only)	\??\A:	AnnualReport.exe
File opened (read-only)	\??\F:	AnnualReport.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1540	powershell.exe
1540	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1540	powershell.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1304	AnnualReport.exe
1304	AnnualReport.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1304 wrote to memory of 1540	1304	AnnualReport.exe	29
PID 1304 wrote to memory of 1540	1304	AnnualReport.exe	29
PID 1304 wrote to memory of 1540	1304	AnnualReport.exe	29
PID 1304 wrote to memory of 1540	1304	AnnualReport.exe	29

C:\Users\Admin\AppData\Local\Temp\AnnualReport.exe
"C:\Users\Admin\AppData\Local\Temp\AnnualReport.exe"
1⤵
- Enumerates connected drives
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1304
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\1a4307bd1553d0aa04b9}"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1540

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/1304-68-0x00000000002A0000-0x00000000002FD000-memory.dmp

Filesize
372KB

Download
memory/1304-61-0x0000000000390000-0x00000000003F0000-memory.dmp

Filesize
384KB

Download
memory/1304-64-0x0000000040000000-0x000000004005E000-memory.dmp

Filesize
376KB

Download
memory/1304-60-0x0000000075AD1000-0x0000000075AD3000-memory.dmp

Filesize
8KB

Download
memory/1540-72-0x0000000002600000-0x000000000324A000-memory.dmp

Filesize
12.3MB

Download
memory/1540-77-0x0000000005620000-0x0000000005621000-memory.dmp

Filesize
4KB

Download
memory/1540-70-0x00000000047E0000-0x00000000047E1000-memory.dmp

Filesize
4KB

Download
memory/1540-71-0x0000000002600000-0x000000000324A000-memory.dmp

Filesize
12.3MB

Download
memory/1540-73-0x0000000002600000-0x0000000002601000-memory.dmp

Filesize
4KB

Download
memory/1540-74-0x0000000005240000-0x0000000005241000-memory.dmp

Filesize
4KB

Download
memory/1540-69-0x0000000000FA0000-0x0000000000FA1000-memory.dmp

Filesize
4KB

Download
memory/1540-82-0x00000000056F0000-0x00000000056F1000-memory.dmp

Filesize
4KB

Download
memory/1540-83-0x00000000061F0000-0x00000000061F1000-memory.dmp

Filesize
4KB

Download
memory/1540-90-0x000000007EF30000-0x000000007EF31000-memory.dmp

Filesize
4KB

Download
memory/1540-91-0x0000000006280000-0x0000000006281000-memory.dmp

Filesize
4KB

Download
memory/1540-92-0x00000000055D0000-0x00000000055D1000-memory.dmp

Filesize
4KB

Download
memory/1540-106-0x0000000006300000-0x0000000006301000-memory.dmp

Filesize
4KB

Download
memory/1540-107-0x0000000006310000-0x0000000006311000-memory.dmp

Filesize
4KB

Download

Analysis

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