buer | 41a4ee153b3c61cc8ed50de571e5b8f884de1c8c07332b7b31f238360832988c

Resubmissions

12-02-2021 16:10

210212-y931k5cqtn 10

10-02-2021 20:48

210210-yxgp15f1tx 10

Analysis

max time kernel
1121s
max time network
1124s
platform
windows10_x64
resource
win10v20201028
submitted
12-02-2021 16:10

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General

Target

SCD10093264.jpg.exe
Size

104KB
MD5

1fa27c5e084887e9e3a2e232d27e10e3
SHA1

a7c98a694753ed745e8618369d16e39c46cca1e7
SHA256

41a4ee153b3c61cc8ed50de571e5b8f884de1c8c07332b7b31f238360832988c
SHA512

81ecb5e4b3ea478f27509d1eafd106ec224fc0ccdfd411cb3b2345fc752d738f6300fd575a2941611e1763dce125364fb765a48835249cd7e7e33e28a01f40b5

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

dtermalherbhos.com

Signatures

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

Suspicious use of NtCreateProcessExOtherParentProcess 1 IoCs

description	pid	Process	procid_target
PID 3844 created 2668	3844	WerFault.exe	77

Buer Loader 1 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral1/memory/2668-4-0x0000000040000000-0x000000004000A000-memory.dmp	buer

Loads dropped DLL 1 IoCs

pid	Process
3920	SCD10093264.jpg.exe

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:	SCD10093264.jpg.exe
File opened (read-only)	\??\M:	SCD10093264.jpg.exe
File opened (read-only)	\??\S:	SCD10093264.jpg.exe
File opened (read-only)	\??\X:	SCD10093264.jpg.exe
File opened (read-only)	\??\H:	SCD10093264.jpg.exe
File opened (read-only)	\??\J:	SCD10093264.jpg.exe
File opened (read-only)	\??\I:	SCD10093264.jpg.exe
File opened (read-only)	\??\N:	SCD10093264.jpg.exe
File opened (read-only)	\??\O:	SCD10093264.jpg.exe
File opened (read-only)	\??\Y:	SCD10093264.jpg.exe
File opened (read-only)	\??\A:	SCD10093264.jpg.exe
File opened (read-only)	\??\B:	SCD10093264.jpg.exe
File opened (read-only)	\??\G:	SCD10093264.jpg.exe
File opened (read-only)	\??\K:	SCD10093264.jpg.exe
File opened (read-only)	\??\R:	SCD10093264.jpg.exe
File opened (read-only)	\??\V:	SCD10093264.jpg.exe
File opened (read-only)	\??\Z:	SCD10093264.jpg.exe
File opened (read-only)	\??\E:	SCD10093264.jpg.exe
File opened (read-only)	\??\F:	SCD10093264.jpg.exe
File opened (read-only)	\??\T:	SCD10093264.jpg.exe
File opened (read-only)	\??\U:	SCD10093264.jpg.exe
File opened (read-only)	\??\W:	SCD10093264.jpg.exe
File opened (read-only)	\??\P:	SCD10093264.jpg.exe
File opened (read-only)	\??\Q:	SCD10093264.jpg.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3920 set thread context of 2668	3920	SCD10093264.jpg.exe	77

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3844	2668	WerFault.exe	77

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
3844	WerFault.exe
3844	WerFault.exe
3844	WerFault.exe
3844	WerFault.exe
3844	WerFault.exe
3844	WerFault.exe
3844	WerFault.exe
3844	WerFault.exe
3844	WerFault.exe
3844	WerFault.exe
3844	WerFault.exe
3844	WerFault.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
3920	SCD10093264.jpg.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeRestorePrivilege	3844	WerFault.exe
Token: SeBackupPrivilege	3844	WerFault.exe
Token: SeDebugPrivilege	3844	WerFault.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 3920 wrote to memory of 2668	3920	SCD10093264.jpg.exe	77
PID 3920 wrote to memory of 2668	3920	SCD10093264.jpg.exe	77
PID 3920 wrote to memory of 2668	3920	SCD10093264.jpg.exe	77
PID 3920 wrote to memory of 2668	3920	SCD10093264.jpg.exe	77

C:\Users\Admin\AppData\Local\Temp\SCD10093264.jpg.exe
"C:\Users\Admin\AppData\Local\Temp\SCD10093264.jpg.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3920
- C:\Users\Admin\AppData\Local\Temp\SCD10093264.jpg.exe
  "C:\Users\Admin\AppData\Local\Temp\SCD10093264.jpg.exe"
  2⤵
  - Enumerates connected drives
  PID:2668
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2668 -s 22696
    3⤵
    - Suspicious use of NtCreateProcessExOtherParentProcess
    - Program crash
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3844

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2668-4-0x0000000040000000-0x000000004000A000-memory.dmp

Filesize
40KB

Download
memory/3844-5-0x00000000043E0000-0x00000000043E1000-memory.dmp

Filesize
4KB

Download