buer | 4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d

General

Target

b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
Size

693KB
MD5

b61b330f0ad589422d862cebf65e92c1
SHA1

54d7cb2745607e2ea52db8423cf9f210c7674ee6
SHA256

4c51b8b7cd48ab404a9259da953f6222d73b80b9ce440dd2fe6632000090e73d
SHA512

534bc27db1c8df0ff2c7e5aaf4dc6a4aaffde931e3dacb2490b219c3a0323362afdec5d65d18d6c1ba44cbd384a1020319ff3298ab1330cab459b8b198d46dc1
SSDEEP

6144:/mLwKpYnJEmpdSiWRWUJsT9IFinLwObXRPSPh8Ad9hPp5GtSkAOCnEIqnO9ykYHz:/SOEoWRGxnDx89haYRTnCO9oaEJ

Score

10^/10

buer execution loader

Malware Config

Extracted

Family

buer

C2

https://bankcreditsign.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.

loader

resource	yara_rule
behavioral2/memory/4632-4-0x0000000040000000-0x000000004005D000-memory.dmp	buer
behavioral2/memory/4632-0-0x0000000002580000-0x00000000025E0000-memory.dmp	buer
behavioral2/memory/4632-7-0x00000000023E0000-0x000000000243E000-memory.dmp	buer

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
5012	powershell.exe

Enumerates connected drives 3 TTPs 23 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)	\??\U:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\Y:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\B:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\I:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\L:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\M:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\Q:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\K:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\N:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\X:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\Z:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\E:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\J:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\R:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\S:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\V:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\T:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\W:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\A:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\G:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\H:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\O:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
File opened (read-only)	\??\P:	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
5012	powershell.exe
5012	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5012	powershell.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4632 wrote to memory of 5012	4632	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe	89
PID 4632 wrote to memory of 5012	4632	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe	89
PID 4632 wrote to memory of 5012	4632	b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe	89

C:\Users\Admin\AppData\Local\Temp\b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\b61b330f0ad589422d862cebf65e92c1_JaffaCakes118.exe"
1⤵
- Enumerates connected drives
- Suspicious use of WriteProcessMemory
PID:4632
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\71ab19a7c73041281b89}"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:5012

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4248,i,17325488789339133686,9539570259395798500,262144 --variations-seed-version --mojo-platform-channel-handle=3760 /prefetch:8
1⤵
PID:4664

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

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

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_d0k5tawi.ovk.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/4632-0-0x0000000002580000-0x00000000025E0000-memory.dmp

Filesize
384KB

Download
memory/4632-7-0x00000000023E0000-0x000000000243E000-memory.dmp

Filesize
376KB

Download
memory/4632-56-0x0000000000400000-0x00000000004BF000-memory.dmp

Filesize
764KB

Download
memory/4632-4-0x0000000040000000-0x000000004005D000-memory.dmp

Filesize
372KB

Download
memory/5012-29-0x0000000006B90000-0x0000000006BC2000-memory.dmp

Filesize
200KB

Download
memory/5012-40-0x0000000006BD0000-0x0000000006BEE000-memory.dmp

Filesize
120KB

Download
memory/5012-12-0x0000000005E30000-0x0000000005E52000-memory.dmp

Filesize
136KB

Download
memory/5012-14-0x0000000005ED0000-0x0000000005F36000-memory.dmp

Filesize
408KB

Download
memory/5012-13-0x0000000074440000-0x0000000074BF0000-memory.dmp

Filesize
7.7MB

Download
memory/5012-15-0x0000000005F40000-0x0000000005FA6000-memory.dmp

Filesize
408KB

Download
memory/5012-10-0x00000000056B0000-0x0000000005CD8000-memory.dmp

Filesize
6.2MB

Download
memory/5012-25-0x0000000006210000-0x0000000006564000-memory.dmp

Filesize
3.3MB

Download
memory/5012-26-0x00000000065C0000-0x00000000065DE000-memory.dmp

Filesize
120KB

Download
memory/5012-27-0x0000000006600000-0x000000000664C000-memory.dmp

Filesize
304KB

Download
memory/5012-28-0x0000000074440000-0x0000000074BF0000-memory.dmp

Filesize
7.7MB

Download
memory/5012-9-0x0000000005010000-0x0000000005046000-memory.dmp

Filesize
216KB

Download
memory/5012-30-0x0000000070260000-0x00000000702AC000-memory.dmp

Filesize
304KB

Download
memory/5012-11-0x0000000074440000-0x0000000074BF0000-memory.dmp

Filesize
7.7MB

Download
memory/5012-41-0x00000000077B0000-0x0000000007853000-memory.dmp

Filesize
652KB

Download
memory/5012-42-0x0000000074440000-0x0000000074BF0000-memory.dmp

Filesize
7.7MB

Download
memory/5012-43-0x0000000074440000-0x0000000074BF0000-memory.dmp

Filesize
7.7MB

Download
memory/5012-44-0x0000000007F30000-0x00000000085AA000-memory.dmp

Filesize
6.5MB

Download
memory/5012-45-0x00000000078F0000-0x000000000790A000-memory.dmp

Filesize
104KB

Download
memory/5012-46-0x0000000007980000-0x000000000798A000-memory.dmp

Filesize
40KB

Download
memory/5012-47-0x0000000007B90000-0x0000000007C26000-memory.dmp

Filesize
600KB

Download
memory/5012-48-0x0000000007B10000-0x0000000007B21000-memory.dmp

Filesize
68KB

Download
memory/5012-49-0x0000000007B40000-0x0000000007B4E000-memory.dmp

Filesize
56KB

Download
memory/5012-50-0x0000000007B50000-0x0000000007B64000-memory.dmp

Filesize
80KB

Download
memory/5012-51-0x0000000007C50000-0x0000000007C6A000-memory.dmp

Filesize
104KB

Download
memory/5012-52-0x0000000007C30000-0x0000000007C38000-memory.dmp

Filesize
32KB

Download
memory/5012-55-0x0000000074440000-0x0000000074BF0000-memory.dmp

Filesize
7.7MB

Download
memory/5012-8-0x000000007444E000-0x000000007444F000-memory.dmp

Filesize
4KB

Download

Analysis

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