buer | 146bcd0d720f43d289c66d3a3cdc77e5e5a3d924174ee1993ac6db2cb0ca8026

Resubmissions

18-12-2020 09:25

201218-s2dg893z32 10

18-12-2020 09:21

201218-dznp549qsa 10

Analysis

max time kernel
1716s
max time network
1592s
platform
windows7_x64
resource
win7v20201028
submitted
18-12-2020 09:25

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General

Target

3f28f4aebf8fa5fc27f5e3b72dac993f.exe
Size

83KB
MD5

3f28f4aebf8fa5fc27f5e3b72dac993f
SHA1

9c03a13ec3c2baa597ae1c759baea9d57ace4599
SHA256

146bcd0d720f43d289c66d3a3cdc77e5e5a3d924174ee1993ac6db2cb0ca8026
SHA512

13c7007f3918350be0f201ebca153f6967302ac1136ea9cd08b8f6d6b12772c8fc1dab05a1458db059db197fd5b04875e315064b6029dc68d558074a7648b595

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

softwareconsbank.com

Signatures

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

Buer Loader 3 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral1/memory/1752-3-0x0000000040000000-0x0000000040009000-memory.dmp	buer
behavioral1/memory/1752-4-0x0000000040005DA8-mapping.dmp	buer
behavioral1/memory/1752-5-0x0000000040000000-0x0000000040009000-memory.dmp	buer

Loads dropped DLL 1 IoCs

pid	Process
1208	3f28f4aebf8fa5fc27f5e3b72dac993f.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)	\??\A:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\K:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\L:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\P:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\U:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\R:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\T:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\Z:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\W:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\E:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\H:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\I:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\J:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\V:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\O:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\Q:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\S:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\B:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\F:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\G:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\M:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\N:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\X:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe
File opened (read-only)	\??\Y:	3f28f4aebf8fa5fc27f5e3b72dac993f.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1208 set thread context of 1752	1208	3f28f4aebf8fa5fc27f5e3b72dac993f.exe	29

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

System Information Discovery
T1082

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1208	3f28f4aebf8fa5fc27f5e3b72dac993f.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1208 wrote to memory of 1752	1208	3f28f4aebf8fa5fc27f5e3b72dac993f.exe	29
PID 1208 wrote to memory of 1752	1208	3f28f4aebf8fa5fc27f5e3b72dac993f.exe	29
PID 1208 wrote to memory of 1752	1208	3f28f4aebf8fa5fc27f5e3b72dac993f.exe	29
PID 1208 wrote to memory of 1752	1208	3f28f4aebf8fa5fc27f5e3b72dac993f.exe	29
PID 1208 wrote to memory of 1752	1208	3f28f4aebf8fa5fc27f5e3b72dac993f.exe	29

C:\Users\Admin\AppData\Local\Temp\3f28f4aebf8fa5fc27f5e3b72dac993f.exe
"C:\Users\Admin\AppData\Local\Temp\3f28f4aebf8fa5fc27f5e3b72dac993f.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1208
- C:\Users\Admin\AppData\Local\Temp\3f28f4aebf8fa5fc27f5e3b72dac993f.exe
  "C:\Users\Admin\AppData\Local\Temp\3f28f4aebf8fa5fc27f5e3b72dac993f.exe"
  2⤵
  - Enumerates connected drives
  PID:1752

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/1752-3-0x0000000040000000-0x0000000040009000-memory.dmp

Filesize
36KB

Download
memory/1752-5-0x0000000040000000-0x0000000040009000-memory.dmp

Filesize
36KB

Download