4a52f4573bff0fec133381692bae31bf73e21a45f8826f14c27dfc8ef410afd1

Analysis

max time kernel
148s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
22-01-2024 18:13

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General

Target

M19-063.ZLetter.01-22-2024 07.53.49 AM.pdf
Size

364KB
MD5

2da293896288a488e0b14c3b64dd3031
SHA1

2d63f0f6251de7cc8c6c70e35b8f9ab30f993a1a
SHA256

4a52f4573bff0fec133381692bae31bf73e21a45f8826f14c27dfc8ef410afd1
SHA512

43bec97201a70caaf281a044152bd74c4878077c6f6751cc7337a018100bee01ac8643d4eae2aada366d63cbe227c6373f1e4766b28e845d821fa3d927c96237
SSDEEP

6144:HjaR9JHFRD4Y28tCgcltSMfFhap4sTwSZv0yeRuIhPJ3T7hRaMSNfI:Hjc9JHD4Y28kg2SMfFUp4sTwSZfeMSFH

Score

1^/10

Malware Config

Signatures

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	AcroRd32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	AcroRd32.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3791175113-1062217823-1177695025-1000\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION	AcroRd32.exe

Suspicious behavior: EnumeratesProcesses 20 IoCs

pid	Process
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4684	AcroRd32.exe

Suspicious use of SetWindowsHookEx 5 IoCs

pid	Process
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe
4684	AcroRd32.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 4684 wrote to memory of 2208	4684	AcroRd32.exe	92
PID 4684 wrote to memory of 2208	4684	AcroRd32.exe	92
PID 4684 wrote to memory of 2208	4684	AcroRd32.exe	92
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 3392	2208	RdrCEF.exe	95
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96
PID 2208 wrote to memory of 2924	2208	RdrCEF.exe	96

C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroRd32.exe
"C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroRd32.exe" "C:\Users\Admin\AppData\Local\Temp\M19-063.ZLetter.01-22-2024 07.53.49 AM.pdf"
1⤵
- Checks processor information in registry
- Modifies Internet Explorer settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4684
- C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe
  "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --backgroundcolor=16514043
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2208
- - C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe
    "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=gpu-process --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --gpu-preferences=GAAAAAAAAAAAB4AAAQAAAAAAAAAAAGAA --use-gl=swiftshader-webgl --gpu-vendor-id=0x1234 --gpu-device-id=0x1111 --gpu-driver-vendor="Google Inc." --gpu-driver-version=3.3.0.2 --gpu-driver-date=2017/04/07 --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --service-request-channel-token=4DF1F7DF9228A974F5A2A0E6F6A2CB15 --mojo-platform-channel-handle=1740 --allow-no-sandbox-job --ignored=" --type=renderer " /prefetch:2
    3⤵
    PID:3392
- - C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe
    "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=renderer --disable-browser-side-navigation --disable-gpu-compositing --service-pipe-token=5FFC641638D98C3848DB3B0ACEBF1E95 --lang=en-US --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --enable-pinch --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --enable-gpu-async-worker-context --content-image-texture-target=0,0,3553;0,1,3553;0,2,3553;0,3,3553;0,4,3553;0,5,3553;0,6,3553;0,7,3553;0,8,3553;0,9,3553;0,10,3553;0,11,3553;0,12,3553;0,13,3553;0,14,3553;0,15,3553;0,16,3553;0,17,3553;0,18,3553;1,0,3553;1,1,3553;1,2,3553;1,3,3553;1,4,3553;1,5,3553;1,6,3553;1,7,3553;1,8,3553;1,9,3553;1,10,3553;1,11,3553;1,12,3553;1,13,3553;1,14,3553;1,15,3553;1,16,3553;1,17,3553;1,18,3553;2,0,3553;2,1,3553;2,2,3553;2,3,3553;2,4,3553;2,5,3553;2,6,3553;2,7,3553;2,8,3553;2,9,3553;2,10,3553;2,11,3553;2,12,3553;2,13,3553;2,14,3553;2,15,3553;2,16,3553;2,17,3553;2,18,3553;3,0,3553;3,1,3553;3,2,3553;3,3,3553;3,4,3553;3,5,3553;3,6,3553;3,7,3553;3,8,3553;3,9,3553;3,10,3553;3,11,3553;3,12,3553;3,13,3553;3,14,3553;3,15,3553;3,16,3553;3,17,3553;3,18,3553;4,0,3553;4,1,3553;4,2,3553;4,3,3553;4,4,3553;4,5,3553;4,6,3553;4,7,3553;4,8,3553;4,9,3553;4,10,3553;4,11,3553;4,12,3553;4,13,3553;4,14,3553;4,15,3553;4,16,3553;4,17,3553;4,18,3553;5,0,3553;5,1,3553;5,2,3553;5,3,3553;5,4,3553;5,5,3553;5,6,3553;5,7,3553;5,8,3553;5,9,3553;5,10,3553;5,11,3553;5,12,3553;5,13,3553;5,14,3553;5,15,3553;5,16,3553;5,17,3553;5,18,3553;6,0,3553;6,1,3553;6,2,3553;6,3,3553;6,4,3553;6,5,3553;6,6,3553;6,7,3553;6,8,3553;6,9,3553;6,10,3553;6,11,3553;6,12,3553;6,13,3553;6,14,3553;6,15,3553;6,16,3553;6,17,3553;6,18,3553 --disable-accelerated-video-decode --service-request-channel-token=5FFC641638D98C3848DB3B0ACEBF1E95 --renderer-client-id=2 --mojo-platform-channel-handle=1760 --allow-no-sandbox-job /prefetch:1
    3⤵
    PID:2924
- - C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe
    "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=gpu-process --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --gpu-preferences=GAAAAAAAAAAAB4AAAQAAAAAAAAAAAGAA --use-gl=swiftshader-webgl --gpu-vendor-id=0x1234 --gpu-device-id=0x1111 --gpu-driver-vendor="Google Inc." --gpu-driver-version=3.3.0.2 --gpu-driver-date=2017/04/07 --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --service-request-channel-token=AC3BFE74F061E38C974EF8464A9F4FC2 --mojo-platform-channel-handle=2184 --allow-no-sandbox-job --ignored=" --type=renderer " /prefetch:2
    3⤵
    PID:1668
- - C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe
    "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=gpu-process --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --gpu-preferences=GAAAAAAAAAAAB4AAAQAAAAAAAAAAAGAA --use-gl=swiftshader-webgl --gpu-vendor-id=0x1234 --gpu-device-id=0x1111 --gpu-driver-vendor="Google Inc." --gpu-driver-version=3.3.0.2 --gpu-driver-date=2017/04/07 --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --service-request-channel-token=4F62766C1EE72A5B56E001E616644800 --mojo-platform-channel-handle=1936 --allow-no-sandbox-job --ignored=" --type=renderer " /prefetch:2
    3⤵
    PID:3340
- - C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe
    "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=renderer --disable-browser-side-navigation --disable-gpu-compositing --service-pipe-token=BAC8DB9731C40D782F49E4A2E8685EC6 --lang=en-US --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --enable-pinch --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --enable-gpu-async-worker-context --content-image-texture-target=0,0,3553;0,1,3553;0,2,3553;0,3,3553;0,4,3553;0,5,3553;0,6,3553;0,7,3553;0,8,3553;0,9,3553;0,10,3553;0,11,3553;0,12,3553;0,13,3553;0,14,3553;0,15,3553;0,16,3553;0,17,3553;0,18,3553;1,0,3553;1,1,3553;1,2,3553;1,3,3553;1,4,3553;1,5,3553;1,6,3553;1,7,3553;1,8,3553;1,9,3553;1,10,3553;1,11,3553;1,12,3553;1,13,3553;1,14,3553;1,15,3553;1,16,3553;1,17,3553;1,18,3553;2,0,3553;2,1,3553;2,2,3553;2,3,3553;2,4,3553;2,5,3553;2,6,3553;2,7,3553;2,8,3553;2,9,3553;2,10,3553;2,11,3553;2,12,3553;2,13,3553;2,14,3553;2,15,3553;2,16,3553;2,17,3553;2,18,3553;3,0,3553;3,1,3553;3,2,3553;3,3,3553;3,4,3553;3,5,3553;3,6,3553;3,7,3553;3,8,3553;3,9,3553;3,10,3553;3,11,3553;3,12,3553;3,13,3553;3,14,3553;3,15,3553;3,16,3553;3,17,3553;3,18,3553;4,0,3553;4,1,3553;4,2,3553;4,3,3553;4,4,3553;4,5,3553;4,6,3553;4,7,3553;4,8,3553;4,9,3553;4,10,3553;4,11,3553;4,12,3553;4,13,3553;4,14,3553;4,15,3553;4,16,3553;4,17,3553;4,18,3553;5,0,3553;5,1,3553;5,2,3553;5,3,3553;5,4,3553;5,5,3553;5,6,3553;5,7,3553;5,8,3553;5,9,3553;5,10,3553;5,11,3553;5,12,3553;5,13,3553;5,14,3553;5,15,3553;5,16,3553;5,17,3553;5,18,3553;6,0,3553;6,1,3553;6,2,3553;6,3,3553;6,4,3553;6,5,3553;6,6,3553;6,7,3553;6,8,3553;6,9,3553;6,10,3553;6,11,3553;6,12,3553;6,13,3553;6,14,3553;6,15,3553;6,16,3553;6,17,3553;6,18,3553 --disable-accelerated-video-decode --service-request-channel-token=BAC8DB9731C40D782F49E4A2E8685EC6 --renderer-client-id=6 --mojo-platform-channel-handle=2448 --allow-no-sandbox-job /prefetch:1
    3⤵
    PID:2076
- - C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe
    "C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\RdrCEF.exe" --type=gpu-process --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --gpu-preferences=GAAAAAAAAAAAB4AAAQAAAAAAAAAAAGAA --use-gl=swiftshader-webgl --gpu-vendor-id=0x1234 --gpu-device-id=0x1111 --gpu-driver-vendor="Google Inc." --gpu-driver-version=3.3.0.2 --gpu-driver-date=2017/04/07 --disable-pack-loading --lang=en-US --log-file="C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF\debug.log" --log-severity=disable --product-version="ReaderServices/19.10.20064 Chrome/64.0.3282.119" --service-request-channel-token=C951C6164FE7E4FA853F278C157522A3 --mojo-platform-channel-handle=2648 --allow-no-sandbox-job --ignored=" --type=renderer " /prefetch:2
    3⤵
    PID:384

C:\Windows\System32\CompPkgSrv.exe
C:\Windows\System32\CompPkgSrv.exe -Embedding
1⤵
PID:2972

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\LocalLow\Adobe\Acrobat\DC\ReaderMessages

Filesize
64KB

MD5
0c12ffcc161b5f77ce57766317e7587b

SHA1
1cc97e6dec02f7aa023f9e779a9392f4e6f794d4

SHA256
5e2f5a54725c10a4a27fc03d52f3d6f39e11d21d4a1394da6e4ce0ca48313a2e

SHA512
80ac9bf6bc71bb2253d5763bdc0bb155fb9a5d6382e8e081320bfb094b80b13084c4ab8db3eecec45040271e1acfc053d2231408e56f4999f82b1e1299412884

Download Submit
C:\Users\Admin\AppData\LocalLow\Adobe\Acrobat\DC\ReaderMessages

Filesize
36KB

MD5
b30d3becc8731792523d599d949e63f5

SHA1
19350257e42d7aee17fb3bf139a9d3adb330fad4

SHA256
b1b77e96279ead2b460de3de70e2ea4f5ad1b853598a4e27a5caf3f1a32cc4f3

SHA512
523f54895fb07f62b9a5f72c8b62e83d4d9506bda57b183818615f6eb7286e3b9c5a50409bc5c5164867c3ccdeae88aa395ecca6bc7e36d991552f857510792e

Download Submit
C:\Users\Admin\AppData\LocalLow\Adobe\Acrobat\DC\ReaderMessages

Filesize
56KB

MD5
752a1f26b18748311b691c7d8fc20633

SHA1
c1f8e83eebc1cc1e9b88c773338eb09ff82ab862

SHA256
111dac2948e4cecb10b0d2e10d8afaa663d78d643826b592d6414a1fd77cc131

SHA512
a2f5f262faf2c3e9756da94b2c47787ce3a9391b5bd53581578aa9a764449e114836704d6dec4aadc097fed4c818831baa11affa1eb25be2bfad9349bb090fe5

Download Submit
memory/4684-28-0x000000000AD50000-0x000000000ADA0000-memory.dmp

Filesize
320KB

Download