buer | cf91ba98b1c8faba7f89257452b72656f810063ba402a1d5e815a881ec43418f

General

Target

fdafeff.exe
Size

362KB
MD5

1be0b4215bf8abfa0bb8920fd7749dc4
SHA1

d5ece5b643c473e4e06e2701d06b3fb8b4327331
SHA256

cf91ba98b1c8faba7f89257452b72656f810063ba402a1d5e815a881ec43418f
SHA512

274942f59b5c3458f8b68b3394cfab46f07370887ee374d216ce0e92c5c1ec1421d117cab685ade33360d98c9fbac88d5d1147c321568c3888e58a48f8777087

Score

10^/10

buer loader

Malware Config

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader 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)	\??\H:	fdafeff.exe
File opened (read-only)	\??\N:	fdafeff.exe
File opened (read-only)	\??\T:	fdafeff.exe
File opened (read-only)	\??\V:	fdafeff.exe
File opened (read-only)	\??\Y:	fdafeff.exe
File opened (read-only)	\??\Z:	fdafeff.exe
File opened (read-only)	\??\A:	fdafeff.exe
File opened (read-only)	\??\G:	fdafeff.exe
File opened (read-only)	\??\I:	fdafeff.exe
File opened (read-only)	\??\J:	fdafeff.exe
File opened (read-only)	\??\L:	fdafeff.exe
File opened (read-only)	\??\M:	fdafeff.exe
File opened (read-only)	\??\O:	fdafeff.exe
File opened (read-only)	\??\S:	fdafeff.exe
File opened (read-only)	\??\U:	fdafeff.exe
File opened (read-only)	\??\B:	fdafeff.exe
File opened (read-only)	\??\E:	fdafeff.exe
File opened (read-only)	\??\F:	fdafeff.exe
File opened (read-only)	\??\K:	fdafeff.exe
File opened (read-only)	\??\P:	fdafeff.exe
File opened (read-only)	\??\Q:	fdafeff.exe
File opened (read-only)	\??\R:	fdafeff.exe
File opened (read-only)	\??\W:	fdafeff.exe
File opened (read-only)	\??\X:	fdafeff.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
740	powershell.exe
740	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	740	powershell.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1088 wrote to memory of 740	1088	fdafeff.exe	25
PID 1088 wrote to memory of 740	1088	fdafeff.exe	25
PID 1088 wrote to memory of 740	1088	fdafeff.exe	25
PID 1088 wrote to memory of 740	1088	fdafeff.exe	25

C:\Users\Admin\AppData\Local\Temp\fdafeff.exe
"C:\Users\Admin\AppData\Local\Temp\fdafeff.exe"
1⤵
- Enumerates connected drives
- Suspicious use of WriteProcessMemory
PID:1088
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\6c3602ec8ffb8551c78e}"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:740

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/740-1-0x0000000073F10000-0x00000000745FE000-memory.dmp

Filesize
6.9MB

Download
memory/740-2-0x0000000000FF0000-0x0000000000FF1000-memory.dmp

Filesize
4KB

Download
memory/740-3-0x00000000048E0000-0x00000000048E1000-memory.dmp

Filesize
4KB

Download
memory/740-4-0x0000000001160000-0x0000000001161000-memory.dmp

Filesize
4KB

Download
memory/740-5-0x0000000004850000-0x0000000004851000-memory.dmp

Filesize
4KB

Download
memory/740-8-0x00000000060B0000-0x00000000060B1000-memory.dmp

Filesize
4KB

Download
memory/740-13-0x00000000060F0000-0x00000000060F1000-memory.dmp

Filesize
4KB

Download
memory/740-14-0x0000000006180000-0x0000000006181000-memory.dmp

Filesize
4KB

Download
memory/740-21-0x0000000006280000-0x0000000006281000-memory.dmp

Filesize
4KB

Download
memory/740-22-0x0000000005650000-0x0000000005651000-memory.dmp

Filesize
4KB

Download
memory/740-36-0x0000000006300000-0x0000000006301000-memory.dmp

Filesize
4KB

Download
memory/740-37-0x0000000006310000-0x0000000006311000-memory.dmp

Filesize
4KB

Download

Analysis

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