buer | 54e173cc3274e55ea57175674c90bf6e5a60ebadbdd24060ea20895cbb41a007

Analysis

max time kernel
146s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20220721-en
resource tags

arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system
submitted
25-07-2022 17:44

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General

Target

Invoice_82915.exe
Size

159KB
MD5

873a420c04260087b84bb5a0e1422925
SHA1

565fa4974e818681989f766b5b9c267a68872968
SHA256

eab3c05e80d1b66bd2d3ed7cfa86ae7ae38ed565bc6b48ae208bb2c61083a106
SHA512

5e7202ca7e8dd575e7da4877468fe60d500b0a836820dfdfbef30adcd24bba50a8aa3527663ef3be25eb2bd16c953281bbedf3359be0fe4435c9d3b76b421431

Score

10^/10

buer loader

Malware Config

Extracted

Family

buer

questbankcustoms.com

Signatures

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

Buer Loader 1 IoCs

Detects Buer loader in memory or disk.

loader

resource	yara_rule
behavioral2/memory/2932-132-0x0000000040000000-0x0000000040009000-memory.dmp	buer

Loads dropped DLL 1 IoCs

pid	Process
1616	Invoice_82915.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1616 set thread context of 2932	1616	Invoice_82915.exe	84

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
1616	Invoice_82915.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1616 wrote to memory of 2932	1616	Invoice_82915.exe	84
PID 1616 wrote to memory of 2932	1616	Invoice_82915.exe	84
PID 1616 wrote to memory of 2932	1616	Invoice_82915.exe	84
PID 1616 wrote to memory of 2932	1616	Invoice_82915.exe	84

C:\Users\Admin\AppData\Local\Temp\Invoice_82915.exe
"C:\Users\Admin\AppData\Local\Temp\Invoice_82915.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1616
- C:\Users\Admin\AppData\Local\Temp\Invoice_82915.exe
  "C:\Users\Admin\AppData\Local\Temp\Invoice_82915.exe"
  2⤵
  PID:2932

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsv2E25.tmp\System.dll

Filesize
11KB

MD5
fccff8cb7a1067e23fd2e2b63971a8e1

SHA1
30e2a9e137c1223a78a0f7b0bf96a1c361976d91

SHA256
6fcea34c8666b06368379c6c402b5321202c11b00889401c743fb96c516c679e

SHA512
f4335e84e6f8d70e462a22f1c93d2998673a7616c868177cac3e8784a3be1d7d0bb96f2583fa0ed82f4f2b6b8f5d9b33521c279a42e055d80a94b4f3f1791e0c

Download Submit
memory/2932-132-0x0000000040000000-0x0000000040009000-memory.dmp

Filesize
36KB

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