836271dc9bb1e5aa9eb619bfff4976612101e05be69f7df808499875196b7da9

General

Target
836271dc9bb1e5aa9eb619bfff4976612101e05be69f7df808499875196b7da9.exe
Size 134KB
Sample240614-a6b4raybka
SHA256 836271dc9bb1e5aa9eb619bfff4976612101e05be69f7df808499875196b7da9
MD5 25b475ad00f9f7a171aaa5cb787d4559
SHA1 674fa8b714d33bb906ead3affa1cc34d93684e7e
SHA512 470ffea13dcdf944f075179911baedf7769d05035b0cc1d563b1be7ddbf0ee9ba3d8994e1b41ccb5666f86fc9bb9cf5fd3cd407d1e5e18adbfc1ab4673b7c2b4
SSDEEP 1536:YGYU/W2/HG6QMauSV3ixJHABLrmhH7i9eNOOg00GqMIK7aGZh3SOs:YfU/WF6QMauSuiWNi9eNOl0007NZIOs
MD5 SHA1 SHA512 SSDEEP

Score

9^/10

Malware Config

Signatures

UPX dump on OEP (original entry point) 6 IoCs

resource	yara_rule
behavioral2/memory/2432-0-0x0000000000AA0000-0x0000000000AC8000-memory.dmp	UPX
behavioral2/files/0x0008000000023249-3.dat	UPX
behavioral2/memory/468-4-0x0000000000740000-0x0000000000768000-memory.dmp	UPX
behavioral2/memory/2432-6-0x0000000000AA0000-0x0000000000AC8000-memory.dmp	UPX
behavioral2/memory/468-7-0x0000000000740000-0x0000000000768000-memory.dmp	UPX
behavioral2/memory/2432-8-0x0000000000AA0000-0x0000000000AC8000-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-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	836271dc9bb1e5aa9eb619bfff4976612101e05be69f7df808499875196b7da9.exe

Executes dropped EXE 1 IoCs

pid	Process
468	wuauclt.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2432-0-0x0000000000AA0000-0x0000000000AC8000-memory.dmp	upx
behavioral2/files/0x0008000000023249-3.dat	upx
behavioral2/memory/468-4-0x0000000000740000-0x0000000000768000-memory.dmp	upx
behavioral2/memory/2432-6-0x0000000000AA0000-0x0000000000AC8000-memory.dmp	upx
behavioral2/memory/468-7-0x0000000000740000-0x0000000000768000-memory.dmp	upx
behavioral2/memory/2432-8-0x0000000000AA0000-0x0000000000AC8000-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"	836271dc9bb1e5aa9eb619bfff4976612101e05be69f7df808499875196b7da9.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 2432 wrote to memory of 468	2432	836271dc9bb1e5aa9eb619bfff4976612101e05be69f7df808499875196b7da9.exe	91
PID 2432 wrote to memory of 468	2432	836271dc9bb1e5aa9eb619bfff4976612101e05be69f7df808499875196b7da9.exe	91
PID 2432 wrote to memory of 468	2432	836271dc9bb1e5aa9eb619bfff4976612101e05be69f7df808499875196b7da9.exe	91
PID 2432 wrote to memory of 4620	2432	836271dc9bb1e5aa9eb619bfff4976612101e05be69f7df808499875196b7da9.exe	101
PID 2432 wrote to memory of 4620	2432	836271dc9bb1e5aa9eb619bfff4976612101e05be69f7df808499875196b7da9.exe	101
PID 2432 wrote to memory of 4620	2432	836271dc9bb1e5aa9eb619bfff4976612101e05be69f7df808499875196b7da9.exe	101

C:\Users\Admin\AppData\Local\Temp\836271dc9bb1e5aa9eb619bfff4976612101e05be69f7df808499875196b7da9.exe
"C:\Users\Admin\AppData\Local\Temp\836271dc9bb1e5aa9eb619bfff4976612101e05be69f7df808499875196b7da9.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:2432
- C:\ProgramData\Update\wuauclt.exe
  "C:\ProgramData\Update\wuauclt.exe" /run
  2⤵
  - Executes dropped EXE
  PID:468
- C:\windows\SysWOW64\cmd.exe
  "C:\windows\system32\cmd.exe" /c del /q "C:\Users\Admin\AppData\Local\Temp\836271dc9bb1e5aa9eb619bfff4976612101e05be69f7df808499875196b7da9.exe" >> NUL
  2⤵
  PID:4620

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 --mojo-platform-channel-handle=1408 --field-trial-handle=2744,i,16362475727591565961,3676688664819797550,262144 --variations-seed-version /prefetch:8
1⤵
PID:4352

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

wuauclt.exe

Path C:\ProgramData\Update\wuauclt.exe
Size 134KB
SHA256 803dfe2739765dc441703ca8f65170c1546077d0c62b92252d676c00258757b4
MD5 c1bc0f8b4e040902e6dd50740cd1e6fb
SHA1 16a023ffd2bbaf737e6a393aa5237fcf68d8441c
SHA512 5e5e370047526fe5e0edac1ae817aa4c50ee5d7033f251eb625fa8f43d952923332b6adfaeaca5dfb76bbcd12e16cf01038ded250f6fd7dc4633bed8b1062021
SSDEEP 1536:YGYU/W2/HG6QMauSV3ixJHABLrmhH7i9eNOOg00GqMIK7aGZh3SOL:YfU/WF6QMauSuiWNi9eNOl0007NZIOL
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/468-4-0x0000000000740000-0x0000000000768000-memory.dmp

Download

memory/468-7-0x0000000000740000-0x0000000000768000-memory.dmp

Download

memory/2432-0-0x0000000000AA0000-0x0000000000AC8000-memory.dmp

Download

memory/2432-6-0x0000000000AA0000-0x0000000000AC8000-memory.dmp

Download

memory/2432-8-0x0000000000AA0000-0x0000000000AC8000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads