b1cb9f3d2ac7a954ea759051df9eab5812d3c838947066fcf971ece0a28826a1

Analysis

max time kernel
132s
max time network
133s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
28-05-2024 02:02

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General

Target

b1cb9f3d2ac7a954ea759051df9eab5812d3c838947066fcf971ece0a28826a1.exe
Size

134KB
MD5

f48acbbb5d3d3e61502a01769f4ad153
SHA1

3359226c1186dca08b90011d43c8018cc1030891
SHA256

b1cb9f3d2ac7a954ea759051df9eab5812d3c838947066fcf971ece0a28826a1
SHA512

7128242bd0de42560ad67695017b4b7911134b96096dfe2bbc1c4167d979592d0dd5492601bd2847ae3c3befbd0adbcfb8679eff29328be68125d79422df66db
SSDEEP

1536:YGYU/W2/HG6QMauSV3ixJHABLrmhH7i9eNOOg00GqMIK7aGZh3SOO:YfU/WF6QMauSuiWNi9eNOl0007NZIOO

Score

9^/10

persistence upx

Malware Config

Signatures

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/2640-0-0x0000000000CF0000-0x0000000000D18000-memory.dmp	UPX
behavioral2/files/0x00080000000235b0-3.dat	UPX
behavioral2/memory/1824-5-0x00000000005A0000-0x00000000005C8000-memory.dmp	UPX
behavioral2/memory/2640-6-0x0000000000CF0000-0x0000000000D18000-memory.dmp	UPX
behavioral2/memory/2640-7-0x0000000000CF0000-0x0000000000D18000-memory.dmp	UPX

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\Control Panel\International\Geo\Nation	b1cb9f3d2ac7a954ea759051df9eab5812d3c838947066fcf971ece0a28826a1.exe

Executes dropped EXE 1 IoCs

pid	Process
1824	wuauclt.exe

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/2640-0-0x0000000000CF0000-0x0000000000D18000-memory.dmp	upx
behavioral2/files/0x00080000000235b0-3.dat	upx
behavioral2/memory/1824-5-0x00000000005A0000-0x00000000005C8000-memory.dmp	upx
behavioral2/memory/2640-6-0x0000000000CF0000-0x0000000000D18000-memory.dmp	upx
behavioral2/memory/2640-7-0x0000000000CF0000-0x0000000000D18000-memory.dmp	upx

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Window Update = "\"C:\\ProgramData\\Update\\wuauclt.exe\" /run"	b1cb9f3d2ac7a954ea759051df9eab5812d3c838947066fcf971ece0a28826a1.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2640 wrote to memory of 1824	2640	b1cb9f3d2ac7a954ea759051df9eab5812d3c838947066fcf971ece0a28826a1.exe	90
PID 2640 wrote to memory of 1824	2640	b1cb9f3d2ac7a954ea759051df9eab5812d3c838947066fcf971ece0a28826a1.exe	90
PID 2640 wrote to memory of 1824	2640	b1cb9f3d2ac7a954ea759051df9eab5812d3c838947066fcf971ece0a28826a1.exe	90
PID 2640 wrote to memory of 1572	2640	b1cb9f3d2ac7a954ea759051df9eab5812d3c838947066fcf971ece0a28826a1.exe	107
PID 2640 wrote to memory of 1572	2640	b1cb9f3d2ac7a954ea759051df9eab5812d3c838947066fcf971ece0a28826a1.exe	107
PID 2640 wrote to memory of 1572	2640	b1cb9f3d2ac7a954ea759051df9eab5812d3c838947066fcf971ece0a28826a1.exe	107

C:\Users\Admin\AppData\Local\Temp\b1cb9f3d2ac7a954ea759051df9eab5812d3c838947066fcf971ece0a28826a1.exe
"C:\Users\Admin\AppData\Local\Temp\b1cb9f3d2ac7a954ea759051df9eab5812d3c838947066fcf971ece0a28826a1.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:2640
- C:\ProgramData\Update\wuauclt.exe
  "C:\ProgramData\Update\wuauclt.exe" /run
  2⤵
  - Executes dropped EXE
  PID:1824
- C:\windows\SysWOW64\cmd.exe
  "C:\windows\system32\cmd.exe" /c del /q "C:\Users\Admin\AppData\Local\Temp\b1cb9f3d2ac7a954ea759051df9eab5812d3c838947066fcf971ece0a28826a1.exe" >> NUL
  2⤵
  PID:1572

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 --no-appcompat-clear --field-trial-handle=1036,i,6576818814118437872,11004518367271063231,262144 --variations-seed-version --mojo-platform-channel-handle=3916 /prefetch:8
1⤵
PID:4944

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\Update\wuauclt.exe

Filesize
134KB

MD5
a5d7d7c4c219ceac943363d6db696dcd

SHA1
da14efad55fad81c1c70f72bdbeb754217f4210e

SHA256
d576f21518eaeae3134997fd9579da238f94bf5812ed4360a01062e86a0bd96b

SHA512
e99bdc71dc2ed8d5f05017813a20b42e77882784bd80201ba04b73b5a57ff8af4dfac79a28004b8e3517b9822e574257ec257a4467eb7a8143f7bdc3894a1d4f

Download Submit
memory/1824-5-0x00000000005A0000-0x00000000005C8000-memory.dmp

Filesize
160KB

Download
memory/2640-0-0x0000000000CF0000-0x0000000000D18000-memory.dmp

Filesize
160KB

Download
memory/2640-6-0x0000000000CF0000-0x0000000000D18000-memory.dmp

Filesize
160KB

Download
memory/2640-7-0x0000000000CF0000-0x0000000000D18000-memory.dmp

Filesize
160KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads